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문제

왼쪽에서 오른쪽으로 늘어선 N개의 열린 박스들이 있다. 각각의 박스에는 정확하게 두개의 공이 있다. 그리고 각각의 공은 흰색 또는 검은색이다.

첫 번째(가장 왼쪽) 박스 위에 크레인이 있다. 그리고 우리는 다음 커맨드를 통해 크레인을 조작할 수 있다.

  • LIJEVO 크레인을 왼쪽 박스로 옮긴다
  • DESNO 크레인을 오른쪽 박스로 옮긴다
  • UZMI BIJELU 아래의 박스로부터 흰색 공을 꺼낸다
  • UZMI CRNU 아래의 박스로부터 검은색 공을 꺼낸다
  • SPUSTI BIJELU 아래의 박스에 흰색 공을 떨어뜨린다
  • SPUSTI CRNU 아래의 박스에 검은색 공을 떨어뜨린다

크레인은 공 두개 까지만 들 수 있다. 반면 각각의 박스에 넣을 수 있는 공의 수에는 제한이 없다.

우리는 다음 조건들이 만족되었을때 공이 "정렬되었다"라고 말한다.

  • 각각의 박스에는 같은색의 공이 정확히 두개씩 있다
  • 흰색 공으로 채워진 어떤 두 박스 사이에 검은색 공으로 채워진 박스는 존재하지 않는다
  • 검은색 공으로 채워진 어떤 두 박스 사이에 흰색 공으로 채워진 박스는 존재하지 않는다

위의 조건을 만족시키도록하는 커맨드의 최소 절차를 찾는 프로그램을 작성하라.

당신의 답에 있는 각각의 커맨드는 유효해야한다(크레인은 가장 왼쪽 박스로부터 왼쪽으로 갈 수없다, 크레인은 2개를 넘는 공을 들어서는 안된다, 등등...).

입력

입력의 첫 번째 줄에는 정수 N이 주어진다, 2 ≤ N ≤ 500.

두 번째 줄에는 N개의 각 박스에 포함된 내용물을 나타내는 이니셜이 차례대로 주어진다.

각 박스에는 'B' 또는 'C'인 두개의 문자가 있다. 문자 'B'는 흰색 공을 나타내고 문자 'C'는 검은색 공을 나타낸다.

출력

각 줄에 하나씩, 모든 커맨드를 출력하라.

테스트 데이터는 유일하진 않더라도, 항상 해법이 존재한다.

예제 입력 1

3
CC BC BC

예제 출력 1

DESNO
UZMI BIJELU
DESNO
SPUSTI BIJELU
UZMI CRNU
LIJEVO
SPUSTI CRNU
[{"problem_id":"3171","problem_lang":"0","title":"\ud06c\ub808\uc778","description":"<p>\uc67c\ucabd\uc5d0\uc11c \uc624\ub978\ucabd\uc73c\ub85c \ub298\uc5b4\uc120 N\uac1c\uc758 \uc5f4\ub9b0 \ubc15\uc2a4\ub4e4\uc774 \uc788\ub2e4. \uac01\uac01\uc758 \ubc15\uc2a4\uc5d0\ub294 \uc815\ud655\ud558\uac8c \ub450\uac1c\uc758 \uacf5\uc774 \uc788\ub2e4. \uadf8\ub9ac\uace0 \uac01\uac01\uc758 \uacf5\uc740 \ud770\uc0c9 \ub610\ub294 \uac80\uc740\uc0c9\uc774\ub2e4.<\/p>\r\n\r\n<p>\uccab \ubc88\uc9f8(\uac00\uc7a5 \uc67c\ucabd) \ubc15\uc2a4 \uc704\uc5d0 \ud06c\ub808\uc778\uc774 \uc788\ub2e4. \uadf8\ub9ac\uace0 \uc6b0\ub9ac\ub294 \ub2e4\uc74c \ucee4\ub9e8\ub4dc\ub97c \ud1b5\ud574 \ud06c\ub808\uc778\uc744 \uc870\uc791\ud560 \uc218 \uc788\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>LIJEVO \ud06c\ub808\uc778\uc744 \uc67c\ucabd \ubc15\uc2a4\ub85c \uc62e\uae34\ub2e4<\/li>\r\n\t<li>DESNO \ud06c\ub808\uc778\uc744 \uc624\ub978\ucabd \ubc15\uc2a4\ub85c \uc62e\uae34\ub2e4<\/li>\r\n\t<li>UZMI BIJELU \uc544\ub798\uc758 \ubc15\uc2a4\ub85c\ubd80\ud130 \ud770\uc0c9 \uacf5\uc744 \uaebc\ub0b8\ub2e4<\/li>\r\n\t<li>UZMI CRNU \uc544\ub798\uc758 \ubc15\uc2a4\ub85c\ubd80\ud130 \uac80\uc740\uc0c9 \uacf5\uc744 \uaebc\ub0b8\ub2e4<\/li>\r\n\t<li>SPUSTI BIJELU \uc544\ub798\uc758 \ubc15\uc2a4\uc5d0 \ud770\uc0c9 \uacf5\uc744 \ub5a8\uc5b4\ub728\ub9b0\ub2e4<\/li>\r\n\t<li>SPUSTI CRNU \uc544\ub798\uc758 \ubc15\uc2a4\uc5d0 \uac80\uc740\uc0c9 \uacf5\uc744 \ub5a8\uc5b4\ub728\ub9b0\ub2e4<\/li>\r\n<\/ul>\r\n\r\n<p>\ud06c\ub808\uc778\uc740 \uacf5 \ub450\uac1c \uae4c\uc9c0\ub9cc \ub4e4 \uc218 \uc788\ub2e4. \ubc18\uba74 \uac01\uac01\uc758 \ubc15\uc2a4\uc5d0 \ub123\uc744 \uc218 \uc788\ub294 \uacf5\uc758 \uc218\uc5d0\ub294 \uc81c\ud55c\uc774 \uc5c6\ub2e4.<\/p>\r\n\r\n<p>\uc6b0\ub9ac\ub294 \ub2e4\uc74c \uc870\uac74\ub4e4\uc774 \ub9cc\uc871\ub418\uc5c8\uc744\ub54c \uacf5\uc774 &quot;\uc815\ub82c\ub418\uc5c8\ub2e4&quot;\ub77c\uace0 \ub9d0\ud55c\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\uac01\uac01\uc758 \ubc15\uc2a4\uc5d0\ub294 \uac19\uc740\uc0c9\uc758 \uacf5\uc774 \uc815\ud655\ud788 \ub450\uac1c\uc529 \uc788\ub2e4<\/li>\r\n\t<li>\ud770\uc0c9 \uacf5\uc73c\ub85c \ucc44\uc6cc\uc9c4 \uc5b4\ub5a4 \ub450 \ubc15\uc2a4 \uc0ac\uc774\uc5d0 \uac80\uc740\uc0c9 \uacf5\uc73c\ub85c \ucc44\uc6cc\uc9c4 \ubc15\uc2a4\ub294 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4<\/li>\r\n\t<li>\uac80\uc740\uc0c9 \uacf5\uc73c\ub85c \ucc44\uc6cc\uc9c4 \uc5b4\ub5a4 \ub450 \ubc15\uc2a4 \uc0ac\uc774\uc5d0 \ud770\uc0c9 \uacf5\uc73c\ub85c \ucc44\uc6cc\uc9c4 \ubc15\uc2a4\ub294 \uc874\uc7ac\ud558\uc9c0 \uc54a\ub294\ub2e4<\/li>\r\n<\/ul>\r\n\r\n<p>\uc704\uc758 \uc870\uac74\uc744 \ub9cc\uc871\uc2dc\ud0a4\ub3c4\ub85d\ud558\ub294 \ucee4\ub9e8\ub4dc\uc758 \ucd5c\uc18c \uc808\ucc28\ub97c \ucc3e\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\ub77c.<\/p>\r\n\r\n<p>\ub2f9\uc2e0\uc758 \ub2f5\uc5d0 \uc788\ub294 \uac01\uac01\uc758 \ucee4\ub9e8\ub4dc\ub294 \uc720\ud6a8\ud574\uc57c\ud55c\ub2e4(\ud06c\ub808\uc778\uc740 \uac00\uc7a5 \uc67c\ucabd \ubc15\uc2a4\ub85c\ubd80\ud130 \uc67c\ucabd\uc73c\ub85c \uac08 \uc218\uc5c6\ub2e4, \ud06c\ub808\uc778\uc740 2\uac1c\ub97c \ub118\ub294 \uacf5\uc744 \ub4e4\uc5b4\uc11c\ub294 \uc548\ub41c\ub2e4, \ub4f1\ub4f1...).<\/p>\r\n","input":"<p>\uc785\ub825\uc758 \uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 \uc815\uc218 N\uc774 \uc8fc\uc5b4\uc9c4\ub2e4, 2 &le; N &le; 500.<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc904\uc5d0\ub294 N\uac1c\uc758 \uac01 \ubc15\uc2a4\uc5d0 \ud3ec\ud568\ub41c \ub0b4\uc6a9\ubb3c\uc744 \ub098\ud0c0\ub0b4\ub294 \uc774\ub2c8\uc15c\uc774 \ucc28\ub840\ub300\ub85c \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\uac01 \ubc15\uc2a4\uc5d0\ub294 &#39;B&#39; \ub610\ub294 &#39;C&#39;\uc778 \ub450\uac1c\uc758 \ubb38\uc790\uac00 \uc788\ub2e4. \ubb38\uc790 &#39;B&#39;\ub294 \ud770\uc0c9 \uacf5\uc744 \ub098\ud0c0\ub0b4\uace0 \ubb38\uc790 &#39;C&#39;\ub294 \uac80\uc740\uc0c9 \uacf5\uc744 \ub098\ud0c0\ub0b8\ub2e4.<\/p>\r\n","output":"<p>\uac01 \uc904\uc5d0 \ud558\ub098\uc529, \ubaa8\ub4e0 \ucee4\ub9e8\ub4dc\ub97c \ucd9c\ub825\ud558\ub77c.<\/p>\r\n\r\n<p>\ud14c\uc2a4\ud2b8 \ub370\uc774\ud130\ub294 \uc720\uc77c\ud558\uc9c4 \uc54a\ub354\ub77c\ub3c4, \ud56d\uc0c1 \ud574\ubc95\uc774 \uc874\uc7ac\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"3171","problem_lang":"1","title":"kutije","description":"<p>There are N open boxes, arranged from left to right. There are exactly two balls in each box, and each ball is either white or black.&nbsp;<\/p>\r\n\r\n<p>There is a crane above the first (leftmost) box and we can operate the crane with the following commands:&nbsp;<\/p>\r\n\r\n<ul>\r\n\t<li>LIJEVO move the crane one box to the left&nbsp;<\/li>\r\n\t<li>DESNO move the crane one box to the right&nbsp;<\/li>\r\n\t<li>UZMI BIJELU take the white ball from the box below&nbsp;<\/li>\r\n\t<li>UZMI CRNU take the black ball from the box below&nbsp;<\/li>\r\n\t<li>SPUSTI BIJELU drop the white ball to the box below&nbsp;<\/li>\r\n\t<li>SPUSTI CRNU drop the black ball to the box below&nbsp;<\/li>\r\n<\/ul>\r\n\r\n<p>The crane can carry only two balls at the same time, but in each box we can put an unlimited number of balls.&nbsp;<\/p>\r\n\r\n<p>We say that the balls are &quot;arranged&quot; if all of the following statements are satisfied:&nbsp;<\/p>\r\n\r\n<ul>\r\n\t<li>there are exactly two balls in each box and they have the same color&nbsp;<\/li>\r\n\t<li>there is no box with black balls between any two boxes with white balls&nbsp;<\/li>\r\n\t<li>there is no box with white balls between any two boxes with black balls&nbsp;<\/li>\r\n<\/ul>\r\n\r\n<p>Write a program that will find some smallest sequence of commands that will arrange the balls so that the above rules are satisfied.&nbsp;<\/p>\r\n\r\n<p>Each command in your solution must be valid (the crane must not go left from the leftmost box, it must not carry more then two balls, etc...).&nbsp;<\/p>\r\n","input":"<p>The first line of input contains an integer N, 2 &le; N &le; 500.&nbsp;<\/p>\r\n\r\n<p>The second line contains a sequence of N letters &ndash; the initial contents of the boxes.&nbsp;<\/p>\r\n\r\n<p>For each box (from left to the right) there are two letters &#39;B&#39; or &#39;C&#39;. The letter &#39;B&#39; represents a white ball and the letter &#39;C&#39; represents a black ball.&nbsp;<\/p>\r\n","output":"<p>Output all of the commands, each on its own line.&nbsp;<\/p>\r\n\r\n<p>Note: the test data will be such that a solution, although not necessarily unique, will always exist.&nbsp;<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc601\uc5b4"}]