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

Q: RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz

A: hmnbhzKRzI
****
Q: oiNEYHxbvAb, bcDDdEYHxbCREd

A: EYHxb
****
Q: kBCyTXCoL, FgAZCyTXTsQ

A:
CyTX
****