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

[Q]: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb
[A]: FonizDqCVv


[Q]: HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA
[A]: uGhWByFlzI


[Q]: pEfXZVCllcwgCh, ujlRtSVCllcwXyGJck
[A]:
VCllcw