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

OUNqomxFcLXhWdfB, gdqomxFcLHQPCu
qomxFcL

xeKSiBafhOWBbYwlGaQ, GUfIsKgafhOWBbYiFWnptAt
afhOWBbY

EnksoHKPRBaMcZRxkhXqL, nBvyfPksoHKPRBaMbyjzZVpLXW

ksoHKPRBaM