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

[Q]: mQvintdwLUpClREgxv, rYnoXBtdwLUpClRwxsqX
[A]: tdwLUpClR


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


[Q]: dAZJwbWVtrkbyACxS, imnoHvywZJwbWVtrkHoNm
[A]:
ZJwbWVtrk