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]: kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv
[A]: ZepVNHqn


[Q]: axrXfe, RzrXhS
[A]:
rX