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]: ffsyysssyyff
[A]: yysssyy


[Q]: aalzlalzlalz
[A]: alzlalzla


[Q]: zzztzgggzzztgtt
[A]:
zgggz