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

SOLUTION: MPTh

PROBLEM: OVZxWYzAAxG, rStOxWYzJeoC

SOLUTION: xWYz

PROBLEM: hVtcSPJarlqWkxN, KzSPJarlNOIgKG

SOLUTION:
SPJarl