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

SOLUTION: rSvJTR

PROBLEM: jkGcUm, dxGcSI

SOLUTION: Gc

PROBLEM: XbjDHRCWxdPbhibUKn, SrpuPDHRCWxdPbKPWEXNWbZ

SOLUTION:
DHRCWxdPb