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: sssrrkkrrrssrk

A: rrkkrr
****
Q: jbjwjjwwwwwb

A: wwwww
****
Q: pvvpppkppp

A:
pppkppp
****