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

[Q]: pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
[A]: FpUjQGiof


[Q]: ktABEFESAVHZkkY, uMjxiESAVHZkZgWUte
[A]: ESAVHZk


[Q]: AtEbGh, ePEbFE
[A]:
Eb