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

Q: XjYkMfARxWBSBjuXyDrFt, EtUxIfiHkMfARxWBSckTLTTnR

A: kMfARxWBS
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Q: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX

A: NCGmJElj
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Q: xGrnHKluexLdYh, kktlrnHKluROJ

A:
rnHKlu
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