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

[Q]: ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf
[A]: AwURXnxB


[Q]: HSsyZzZLZAAq, MFEZzZLJC
[A]: ZzZL


[Q]: xGxPlbHKAbndWccTG, phKAbndWcRDA
[A]:
KAbndWc