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

[Q]: ZhHtTXaUmsQfUMNrnt, KvvebSXaUmsQfBspwM
[A]: XaUmsQf


[Q]: kWnjCoVmCSVuW, RILPKCoVmCSVbaOza
[A]: CoVmCSV


[Q]: jPsXFBgrzYeTXsW, aukbXFBgrzYeMJ
[A]:
XFBgrzYe