시간 제한 메모리 제한 제출 정답 맞은 사람 정답 비율
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문제

창영이는 바이너리 트리를 매우 좋아한다. 그가 가장 좋아하는 게임은 바이너리 트리를 만들고, 노드에 알파벳 대문자를 하나씩 쓰는 것이다. 같은 알파벳을 여러 노드에 쓰지 않는다.

아래는 창영이가 만든 한 바이너리 트리이다.

                                               D
                                              / \
                                             /   \
                                            B     E
                                           / \     \
                                          /   \     \
                                         A     C     G
                                                    /
                                                   /
                                                  F

창영이는 후손들에게 물려주기 위해서, 만든 트리를 항상 종이제 적어놓는다. 이때, 트리를 프리오더 순회한 결과와 인오더로 순회한 결과를 적어 놓는다. 위의 트리를 프리오더로 순회하면 DBACEGF가 되고, 인오더로 순회하면 ABCDEFG가 된다. 창영이는 이 두 순서만 있으면, 트리를 만들 수 있다고 생각했기 때문에, 포스트오더로 순회한 결과는 적지 않았다.

몇 년이 지난 후, 종이를 보고 트리를 다시 만드려고 했다. 하지만 너무 귀찮은 나머지 프로그램을 작성하려고 한다. 트리를 프리오더와 인오더로 순회한 결과가 주어졌을 때, 포스트오더로 순회한 결과를 구하는 프로그램을 작성하시오.

입력

입력은 하나 또는 그 이상의 테스트 케이스로 이루어져 있다.

각 테스트 케이스는 한 줄로 이루어져 있고, 프리오더로 순회한 결과와 인오더로 순회한 결과가 공백으로 구분되어져 있다. 두 문자열의 길이는 항상 같으며, 26자를 넘지 않는다.

출력

각 테스트 케이스에 대해서, 입력으로 주어진 트리를 포스트오더로 순회한 결과를 출력한다.

예제 입력 1

DBACEGF ABCDEFG
BCAD CBAD

예제 출력 1

ACBFGED
CDAB
[{"problem_id":"6597","problem_lang":"0","title":"\ud2b8\ub9ac \ubcf5\uad6c","description":"<p>\ucc3d\uc601\uc774\ub294 \ubc14\uc774\ub108\ub9ac \ud2b8\ub9ac\ub97c \ub9e4\uc6b0 \uc88b\uc544\ud55c\ub2e4. \uadf8\uac00 \uac00\uc7a5 \uc88b\uc544\ud558\ub294 \uac8c\uc784\uc740 \ubc14\uc774\ub108\ub9ac \ud2b8\ub9ac\ub97c \ub9cc\ub4e4\uace0, \ub178\ub4dc\uc5d0 \uc54c\ud30c\ubcb3 \ub300\ubb38\uc790\ub97c \ud558\ub098\uc529 \uc4f0\ub294 \uac83\uc774\ub2e4. \uac19\uc740 \uc54c\ud30c\ubcb3\uc744 \uc5ec\ub7ec \ub178\ub4dc\uc5d0 \uc4f0\uc9c0 \uc54a\ub294\ub2e4.<\/p>\r\n\r\n<p>\uc544\ub798\ub294 \ucc3d\uc601\uc774\uac00 \ub9cc\ub4e0 \ud55c \ubc14\uc774\ub108\ub9ac \ud2b8\ub9ac\uc774\ub2e4.<\/p>\r\n\r\n<pre>\r\n                                               D\r\n                                              \/ \\\r\n                                             \/   \\\r\n                                            B     E\r\n                                           \/ \\     \\\r\n                                          \/   \\     \\\r\n                                         A     C     G\r\n                                                    \/\r\n                                                   \/\r\n                                                  F<\/pre>\r\n\r\n<p>\ucc3d\uc601\uc774\ub294 \ud6c4\uc190\ub4e4\uc5d0\uac8c \ubb3c\ub824\uc8fc\uae30 \uc704\ud574\uc11c, \ub9cc\ub4e0 \ud2b8\ub9ac\ub97c \ud56d\uc0c1 \uc885\uc774\uc81c \uc801\uc5b4\ub193\ub294\ub2e4. \uc774\ub54c, \ud2b8\ub9ac\ub97c \ud504\ub9ac\uc624\ub354 \uc21c\ud68c\ud55c \uacb0\uacfc\uc640 \uc778\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\ub97c \uc801\uc5b4 \ub193\ub294\ub2e4. \uc704\uc758 \ud2b8\ub9ac\ub97c \ud504\ub9ac\uc624\ub354\ub85c \uc21c\ud68c\ud558\uba74 DBACEGF\uac00 \ub418\uace0, \uc778\uc624\ub354\ub85c \uc21c\ud68c\ud558\uba74 ABCDEFG\uac00 \ub41c\ub2e4. \ucc3d\uc601\uc774\ub294 \uc774 \ub450 \uc21c\uc11c\ub9cc \uc788\uc73c\uba74, \ud2b8\ub9ac\ub97c \ub9cc\ub4e4 \uc218 \uc788\ub2e4\uace0 \uc0dd\uac01\ud588\uae30 \ub54c\ubb38\uc5d0, \ud3ec\uc2a4\ud2b8\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\ub294 \uc801\uc9c0 \uc54a\uc558\ub2e4.<\/p>\r\n\r\n<p>\uba87 \ub144\uc774 \uc9c0\ub09c \ud6c4, \uc885\uc774\ub97c \ubcf4\uace0 \ud2b8\ub9ac\ub97c \ub2e4\uc2dc \ub9cc\ub4dc\ub824\uace0 \ud588\ub2e4. \ud558\uc9c0\ub9cc \ub108\ubb34 \uadc0\ucc2e\uc740 \ub098\uba38\uc9c0 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\ub824\uace0 \ud55c\ub2e4. \ud2b8\ub9ac\ub97c \ud504\ub9ac\uc624\ub354\uc640 \uc778\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \ud3ec\uc2a4\ud2b8\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\ub97c \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc2dc\uc624.<\/p>\r\n","input":"<p>\uc785\ub825\uc740 \ud558\ub098 \ub610\ub294 \uadf8 \uc774\uc0c1\uc758 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\ub2e4.<\/p>\r\n\r\n<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub294 \ud55c \uc904\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\uace0, \ud504\ub9ac\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\uc640 \uc778\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4\uc838 \uc788\ub2e4. \ub450 \ubb38\uc790\uc5f4\uc758 \uae38\uc774\ub294 \ud56d\uc0c1 \uac19\uc73c\uba70, 26\uc790\ub97c \ub118\uc9c0 \uc54a\ub294\ub2e4.<\/p>\r\n","output":"<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc5d0 \ub300\ud574\uc11c, \uc785\ub825\uc73c\ub85c \uc8fc\uc5b4\uc9c4 \ud2b8\ub9ac\ub97c \ud3ec\uc2a4\ud2b8\uc624\ub354\ub85c \uc21c\ud68c\ud55c \uacb0\uacfc\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"6597","problem_lang":"1","title":"Tree Recovery","description":"<p>Little Valentine liked playing with binary trees very much. Her favorite game was constructing randomly looking binary trees with capital letters in the nodes.&nbsp;<\/p>\r\n\r\n<p>This is an example of one of her creations:<\/p>\r\n\r\n<pre>\r\n                                               D\r\n                                              \/ \\\r\n                                             \/   \\\r\n                                            B     E\r\n                                           \/ \\     \\\r\n                                          \/   \\     \\\r\n                                         A     C     G\r\n                                                    \/\r\n                                                   \/\r\n                                                  F<\/pre>\r\n\r\n<p>To record her trees for future generations, she wrote down two strings for each tree: a preorder traversal (root, left subtree, right subtree) and an inorder traversal (left subtree, root, right subtree). For the tree drawn above the preorder traversal is DBACEGF and the inorder traversal is ABCDEFG.&nbsp;<\/p>\r\n\r\n<p>She thought that such a pair of strings would give enough information to reconstruct the tree later (but she never tried it).<\/p>\r\n\r\n<p>Now, years later, looking again at the strings, she realized that reconstructing the trees was indeed possible, but only because she never had used the same letter twice in the same tree.&nbsp;<\/p>\r\n\r\n<p>However, doing the reconstruction by hand, soon turned out to be tedious.&nbsp;<\/p>\r\n\r\n<p>So now she asks you to write a program that does the job for her!<\/p>\r\n","input":"<p>The input file will contain one or more test cases.&nbsp;<\/p>\r\n\r\n<p>Each test case consists of one line containing two strings preord and inord, representing the preorder traversal and inorder traversal of a binary tree. Both strings consist of unique capital letters. (Thus they are not longer than 26 characters.)<\/p>\r\n\r\n<p>Input is terminated by end of file.<\/p>\r\n","output":"<p>For each test case, recover Valentine&#39;s binary tree and print one line containing the tree&#39;s postorder traversal (left subtree, right subtree, root)<\/p>\r\n\r\n<p>&nbsp;<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc601\uc5b4"}]