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

ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
UKLTNLJbMK

XqyPjqNZDEK, EfwPjqNgjIP
PjqN

osfxEzSkz, hzSxEzxU

xEz