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

[EX Q]: hcmMoVBhK, mdmMoVBjuT
[EX A]: mMoVB

[EX Q]: WjyKtxKtEYjP, vuBZJZyKtxKtXRZs
[EX A]: yKtxKt

[EX Q]: VKmdJJWEbhYIcgFGgEWEgLp, uAmNfbWEbhYIcgFgrnb
[EX A]:
WEbhYIcgF