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

[Q]: CUlMsvov, iflMsSRp
[A]: lMs


[Q]: DQBpdnwVDcnCDEWpD, gAtCdnwVDcnCYv
[A]: dnwVDcnC


[Q]: VYcKNJPrmWlGDfaJuIS, jGxZcnVKNJPrmWlwTPWyfsD
[A]:
KNJPrmWl