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]: nvvnnvvvnnvnv
[EX A]: vnnvvvnnv

[EX Q]: pfppfvpppppff
[EX A]: ppppp

[EX Q]: mdimmdimididdmd
[EX A]:
dimid