TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: biAihydBoNlzR, IAloNhydBolwUz

SOLUTION: hydBo

PROBLEM: EOwHDdhJcP, DrIuDdhJYw

SOLUTION: DdhJ

PROBLEM: IytAyAtgKzSrb, sDhJGtAyAtgKzSxmypvI

SOLUTION:
tAyAtgKzS