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: ssbsbvbsvsbsbb

A: sbvbs
****
Q: qqqqqqgqggqqqgg

A: ggqqqgg
****
Q: bzbzdzzdbb

A:
dzzd
****