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: ilyiyyylil

A: yiy
****
Q: llllwllwwwllwl

A: lwllwwwllwl
****
Q: bsbbnssnnbnbsn

A:
nssn
****