In this task you will be given a string and you should find the longest substring that is a palindrome. A palindrome is a string that is the same backwards as it is forwards. If the shortest possible palindrome is length 1 you should return the first character.

[Q]: gqqygqqyqqqgyyq
[A]: qqyqq


[Q]: qgnqgngnqq
[A]: gng


[Q]: zvvvvwwwvzwv
[A]:
vwwwv