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: rlrrrllrltrrtll

A: ltrrtl
****
Q: yylylyyyyll

A: yylylyy
****
Q: aaavvggavagvgvg

A:
gavag
****
