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

[Q]: wLLwjL, arLwXm
[A]: Lw


[Q]: gfXPLNzsyfEotmHL, oJeXPLNzsyJuXP
[A]: XPLNzsy


[Q]: BhaoBOWV, rCoBOjYO
[A]:
oBO