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: JAGuNgaUudP, eojvKNgaUuQg

Answer: NgaUu


Question: ktABEFESAVHZkkY, uMjxiESAVHZkZgWUte

Answer: ESAVHZk


Question: ddOrOuINartfJnYnHREb, FrBWKHafINartfJnYnEvWki

Answer:
INartfJnYn