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.

[EX Q]: ggjjzzzggjz
[EX A]: zzz

[EX Q]: tyjjyyjyjyt
[EX A]: yjyjy

[EX Q]: sslrrrrssslrs
[EX A]:
rrrr