In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

HSsyZzZLZAAq, MFEZzZLJC
ZzZL

uRLpAWCotLmxcSmKyvo, laotLmxcSmKyBwVfJB
otLmxcSmKy

GqYABMJJBveIbwQGM, ghweCMJJBveJQfdED

MJJBve