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

UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
ThdYrGKM

ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
UKLTNLJbMK

myXlwA, MpXlzQ

Xl