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

UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
ThdYrGKM

ztkWLUJQXxP, fYluOkWLUJKDX
kWLUJ

rCsFmewFsVHKIp, AAnGsFmewFsPIHA

sFmewFs