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

[Q]: EOacPYivmmUlYenynBqAwx, MoZWMOeXmUlYenynBEendWg
[A]: mUlYenynB


[Q]: lMRuEThD, wqQRuEKp
[A]: RuE


[Q]: OaGGejUwAlpXKUFIKnJSSFvy, WXiPppXKUFIKnJSeSTXDPi
[A]:
pXKUFIKnJS