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

Q: uGDJixAmSiVaFRmfKRM, NsTGxsJixAmSiVageSw

A: JixAmSiVa
****
Q: xQcYRVFFqrVAMsBm, VErcKZvcYRVFFqzKo

A: cYRVFFq
****
Q: eljOBqAM, dbjOBzj

A:
jOB
****