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: cncnancaan

A: cnanc
****
Q: bbdbbbssbddsdd

A: bbdbb
****
Q: bnbaanbbbbnn

A:
nbbbbn
****