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

[Q]: rCFrfkmXbSHK, mztfkmXwez
[A]: fkmX


[Q]: aeQjEeiWGONmzGimhGiw, RIEeiWGONmOZuVYr
[A]: EeiWGONm


[Q]: uQQLNTbn, PHLNTKuP
[A]:
LNT