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

[Q]: IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs
[A]: BqdPcXfHot


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


[Q]: fPWJsGwuHALzU, mskesGwuHALIs
[A]:
sGwuHAL