Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
gocogccocco
Solution: gocog
Reason: The substring 'gocog' is the longest possible substring that is also a palindrome. So this is a good example.

Now, solve this instance: apppapadpap
Student:
apppa