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

[Q]: sEYtoQlG, XIstoQQPw
[A]: toQ


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


[Q]: LoFlZVwmBDJvvUMSo, bzPwmBDJvvDjIUe
[A]:
wmBDJvv


