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: hhzszzhzhzshssh

A: zhzhz
****
Q: wwqnnqnwqnnwqn

A: qnnq
****
Q: xxrrxzzxzzzzzrx

A:
zzxzz
****
