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

SOLUTION: VKijey

PROBLEM: EeUODjkxsQeTSNsHYpBKIUvEuAKhB, SrpZeTSNsHYpBKdhPFlgMh

SOLUTION: eTSNsHYpBK

PROBLEM: ntVYkxrjaha, RavTYzYkxrjamNZM

SOLUTION:
Ykxrja