Statement

William loves strings and their properties, and he is especially fond of palindromes. He likes palindromes so much, that he started reading lots of research papers on them and finally stumbled upon a new kind of property that generalizes the palindrome concept: the kalindrome. We say that a string is a kalindrome if, for some positive integer K, it's possible to split the string in many substrings, each of them K characters long, so that they can be "read" from left to right in the same way as right to left. More precisely: if we concatenate the substrings starting from the last one, we will recreate the original string. For example: the word "banaba" is a kalindrome, because if we choose K=2 then we obtain the substrings: ba, na, ba, which can indeed be concatenated starting from the last one, to reconstruct the original word...