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

SOLUTION: COoLMp

PROBLEM: feYKRk, PrYKMW

SOLUTION: YK

PROBLEM: zmbmQuyNGOe, mUMEmQuyiuS

SOLUTION:
mQuy