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: zzsuuuuzszs

A: uuuu
****
Q: mvmhhhhhvmhhmhv

A: hhhhh
****
Q: hhhihihiiim

A:
hihih
****