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

uRLpAWCotLmxcSmKyvo, laotLmxcSmKyBwVfJB
otLmxcSmKy

YcgVJVACcQE, JsJVACcSz
JVACc

lWbFazUuVDU, anHFazUWgAx

FazU