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]: fifpfppfii
[A]: fppf


[Q]: fnnfknnfnfkf
[A]: fnnf


[Q]: ydyygyddyy
[A]:
yddy