In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: yiKkIxbKvNk, znaIxbKggg

A: IxbK
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Q: UIjAMFDuxDDGkfQa, VdsHuxDDGkfZHZZ

A: uxDDGkf
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Q: CavcLgWjO, sXqvcLgWkC

A:
vcLgW
****