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

[Q]: RpaZAvSnEBgGapIPQgw, wcwYsXvSnEBgGapIwoIWROB
[A]: vSnEBgGapI


[Q]: BmxgSFWBlVX, kGgKrgSFWBlGunFcZ
[A]: gSFWBl


[Q]: NdbQXdBoNNT, wroRXdBoBEj
[A]:
XdBo