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

[Q]: ksRxEVrz, cOMRxEViwF
[A]: RxEV


[Q]: IzwlZDJSEFPxfIud, xwWSYwlZDJSEFPbvSXTlS
[A]: wlZDJSEFP


[Q]: dvjyHmrlZkqTLa, ibRHmrlZmWHuG
[A]:
HmrlZ