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

SOLUTION: WhcSCpvC

PROBLEM: ZRjPgqbLL, uIsmPgqbBB

SOLUTION: Pgqb

PROBLEM: iGiTlYHtX, qfHiTlYsZ

SOLUTION:
iTlY