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]: FgQsxN, UMQsIa
[A]: Qs


[Q]: ueBmfbYckODHErsyyx, JOFssqmfbYckODHFKKVNKDx
[A]:
mfbYckODH