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

[Q]: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL
[A]: HMpUYADGfE


[Q]: lQwpMQRxuVbJDv, UkzwpMQRxuDVT
[A]: wpMQRxu


[Q]: uPmttNOtSKYzy, eWgtNOtSkL
[A]:
tNOtS