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: cqdccqdqdqcq

A: cqdqdqc
****
Q: bbdbbbssbddsdd

A: bbdbb
****
Q: rrzrzzzjrr

A:
rzr
****