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

Q: UvYbfKFybXofcwLRrLRiK, BgMZKFybXofcVe

A: KFybXofc
****
Q: mvIvSzMtYsfVLdaGEmef, wnzMtYsfVLdaKm

A: zMtYsfVLda
****
Q: MSzHyOuaJILkeY, eUibEHoHyOuaJIhfvXy

A:
HyOuaJI
****