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

[Q]: zzEhnt, sYEhtc
[A]: Eh


[Q]: sdGIVJPsWWszKPCGk, ghRJPsWWszKcJUg
[A]: JPsWWszK


[Q]: wMdAnH, ytdAYm
[A]:
dA