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

[Q]: oWwqraAz, uxTqraonu
[A]: qra


[Q]: ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
[A]: UKLTNLJbMK


[Q]: HhBhJMpxpty, MxTJMpxnQEf
[A]:
JMpx