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

[Q]: YKpdeJQhzyYiPoODACUu, mjmnIlCehzyYiPoOzZ
[A]: hzyYiPoO


[Q]: CUxfOt, dyxfNp
[A]: xf


[Q]: pXJhplKMrqzktjyfanesW, gAMrqzktjyfqotP
[A]:
Mrqzktjyf