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

[Q]: zBxuZfJgYrlRSzkmAktO, YNMgYrlRSzklmBOH
[A]: gYrlRSzk


[Q]: JAfPtjqqUYMD, cpXItjqqFN
[A]: tjqq


[Q]: ohXBtvJWPFcltYfohmZTQ, OaPWPFcltYftMgjG
[A]:
WPFcltYf