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

[Q]: dReySjyqecU, loSjyqiRl
[A]: Sjyq


[Q]: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr
[A]: ImMTISYd


[Q]: wwHQQJCfe, UNQQJed
[A]:
QQJ