instruction:
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:
kkoeekoookeo
answer:
ekoooke


question:
llfflfllafaaa
answer:
lffl


question:
vsvrrrrsvrrv
answer:

rrrr