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

Q: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX

A: NCGmJElj
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Q: qMnjlfIsQRtUlPggCpHqu, gfVndMwYDIsQRtUlPgqBJKCX

A: IsQRtUlPg
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Q: XaMCVWNUALNpcSnU, aUgXIVWNUALNza

A:
VWNUALN
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