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

Q: CiElmOvTqJGVJkfSaDRzE, EjDJwMyxTvTqJGVJkfluB

A: vTqJGVJkf
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Q: XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs

A: RkfCFZGOy
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Q: KXaXGlNOqbNfcThbeneiy, FlGlNOqbNfcTUMgiS

A:
GlNOqbNfcT
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