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

Q: XmiLktrUjJDOCJ, UIKrUjJDOQsR

A: rUjJDO
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Q: NNpkdhvgT, BMkAkdhvrwV

A: kdhv
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Q: hXYNzsFxmxdYouTu, pSvNzsFxmxay

A:
NzsFxmx
****