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

OUNqomxFcLXhWdfB, gdqomxFcLHQPCu
qomxFcL

aIZIsqL, wxSZIsEnO
ZIs

fjCYjTRZwW, WqZYjTRvGHO

YjTR