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: IobjElBjKvpepE, kRulBjKvvxU

Answer: lBjKv


Question: eFUexDIFlaPDUwrOb, mTvkKGUxDIFlaPDUwxGVpnIwbi

Answer: xDIFlaPDUw


Question: CkZOSZevST, bbZOSZIg

Answer:
ZOSZ