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

Q: sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD

A: bUtmnKaEJ
****
Q: dlzequypR, Puequqv

A: equ
****
Q: GLzWnftNVrjc, FUzWnfthD

A:
zWnft
****