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

Q: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA

A: cuzFgsd
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Q: jJSSBmflUyrEMLjSycA, YkmujkSSBmflUyrKKJZ

A: SSBmflUyr
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Q: ZkZauphkb, lBaupXc

A:
aup
****