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: isizisiiziiis

A: isizisi
****
Q: aaqaeaaeqqeq

A: eaae
****
Q: wmttmtmtmmtmt

A:
tmtmmtmt
****