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

SOLUTION: ReSfuLcbzm

PROBLEM: YRLHFm, odLHCI

SOLUTION: LH

PROBLEM: eJfbdNyj, tMfbdNzKOy

SOLUTION:
fbdN