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

SOLUTION: TbY

PROBLEM: yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC

SOLUTION: PZYoKUoQn

PROBLEM: pTcKHsZaiuyLQlHd, fxKHsZaiuyLQtjbudg

SOLUTION:
KHsZaiuyLQ