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]: yyvyvvyynnyv
[EX A]: yvvy

[EX Q]: sssossocoo
[EX A]: ssoss

[EX Q]: vmpvpvvvmvmp
[EX A]:
pvp