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

SOLUTION: MRTxCxbs

PROBLEM: tftBHoDOYxCoTHVf, qhHoDOYxfUU

SOLUTION: HoDOYx

PROBLEM: ZWlBVkVfQyPjGXCBvWSjRmTq, yXcojPEuyPjGXCBvWCvHz

SOLUTION:
yPjGXCBvW