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]: bOvlVNWf, iivlVzWt
[A]: vlV


[Q]: PnRypl, HvRydi
[A]:
Ry