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]: yvgvvyvyvgg
[A]: vyvyv


[Q]: ggjjzzzggjz
[A]: zzz


[Q]: bbbbbvbbbb
[A]:
bbbbvbbbb