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

Answer: qomxFcL


Question: LJJvLTK, jpFJvLqh

Answer: JvL


Question: UJRyOV, GiRyWz

Answer:
Ry