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: acaccsscassa

A: cssc
****
Q: grqqqrqrqgggrg

A: rqqqr
****
Q: rrdddrrdnnrd

A:
rrdddrr
****