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

[Q]: njzfcapS, JDzfcYQh
[A]: zfc


[Q]: oHoJrr, YAoJSq
[A]: oJ


[Q]: hYFmXepcaszXbuEZsWP, yfhUTcaszXbupAuh
[A]:
caszXbu