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|1 초||256 MB||0||0||0||0.000%|
Create a string of N lowercase letters S1S2 . . . SN where 1 ≤ N ≤ 212. The string should have exactly K unique substrings.
A substring is the sequence of letters of the form SLSL+1 . . . SR−1SR for some 1 ≤ L ≤ R ≤ N. Two substrings are the same if they are the same sequence of letters.
Line 1 contains one integer K (1 ≤ K ≤ 222). N is not given; the string that you create may have any number of letters N as long as 1 ≤ N ≤ 212.
Print one line with one string of N lowercase letters where 1 ≤ N ≤ 212. It should have exactly K unique substrings. If there are multiple such strings, any will be accepted. It can be proven that such a string always exists with the given constraints of N and K.
For the first example, the 15 unique substrings of banana are
nana. Another string that has 15 unique substrings is
aaaaaaaaaaaaaaa which would also be a correct output for the first example.