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]: DQVkAbWTTPhoBx, TeWTTPhonxcIKL
[A]: WTTPho


[Q]: fxOGsdkZdkK, UkOGsdkXXfQ
[A]:
OGsdk