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.
--------
Question: nvvnnvvvnnvnv

Answer: vnnvvvnnv


Question: vvwwviiiiwwv

Answer: vwwv


Question: zzuueuuuzzuu

Answer:
uuzzuu