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: zfUPUDeKbCMQa, BkAJFJUDeKbCMZmkFu

Answer: UDeKbCM


Question: VGRjWGHRcBdFmkVg, eSwqALQXWGHRcBdFsDXCM

Answer: WGHRcBdF


Question: fiEhTnsTqXIiCV, ILphTnsTqbT

Answer:
hTnsTq