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

SOLUTION: coYJFWL

PROBLEM: RpaZAvSnEBgGapIPQgw, wcwYsXvSnEBgGapIwoIWROB

SOLUTION: vSnEBgGapI

PROBLEM: gXzvUhEeJKcrHdlBUFL, zzhjjRveJKcrHdQiyqQ

SOLUTION:
eJKcrHd