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.

[EX Q]: bjjiibbjjjjbji
[EX A]: bjjjjb

[EX Q]: tztzxzxtzxtzzt
[EX A]: tzzt

[EX Q]: navavavanv
[EX A]:
navavavan