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:
pmplmllllppppll
answer:
llppppll


question:
jbjjijijiibj
answer:
jijij


question:
spspptttppssstp
answer:

spptttpps