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]: dReySjyqecU, loSjyqiRl
[A]: Sjyq


[Q]: kKcNHI, zDcNby
[A]:
cN