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: yhhzISsXKEbA, KlPrazISsXKzmrVBG

Answer: zISsXK


Question: FQAznAuFjoBKRKB, hPmtFFPnuAznAuFjoBKTgkeJyjcd

Answer: AznAuFjoBK


Question: jARBywdPLkB, xNyRBywdNklh

Answer:
RBywd