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

[Q]: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ
[A]: WaoGKHG


[Q]: rvLoiycpZw, idcvoiycpcLyD
[A]: oiycp


[Q]: gwMFESuNMIRxYk, IbsvpESuNMINOfdqn
[A]:
ESuNMI