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

[Q]: fCGEhfHvcRouHzNw, gtjBkhfHvcRouHee
[A]: hfHvcRouH


[Q]: vytthSjj, XVttthSFAvk
[A]: tthS


[Q]: ZnebMMFMiYwpMSXcUYyJABhjUD, jbZvQCNbEYwpMSXcUYDMbOoTSu
[A]:
YwpMSXcUY