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: hrhhhhhbhrhhrb

A: hhhhh
****
Q: avvvvaaaaavvzzv

A: vvaaaaavv
****
Q: yyybybbyybcbbcb

A:
bcbbcb
****