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

SOLUTION: zsmH

PROBLEM: ztkWLUJQXxP, fYluOkWLUJKDX

SOLUTION: kWLUJ

PROBLEM: WAkaTf, MokaXA

SOLUTION:
ka