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: grqqqrqrqgggrg

A: rqqqr
****
Q: yyvjjyvvyvyvy

A: vyvyv
****
Q: udddduduuuuduu

A:
uduuuudu
****
