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: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

Answer: ERnjubLF


Question: CuizrSvJTRWZK, udyrSvJTRZzkS

Answer: rSvJTR


Question: arDmTqCbEYVWrHI, jDeqCbEYUqcUP

Answer:
qCbEY