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

[Q]: sOSXbnluNuvwMETKda, JzXbnluNuvyeVHO
[A]: XbnluNuv


[Q]: ZRjPgqbLL, uIsmPgqbBB
[A]: Pgqb


[Q]: UIywiqSQYiNY, zrMxKCwiqSQYDWTwO
[A]:
wiqSQY