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

Q: zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv

A: dAdXQfQCAm
****
Q: MSzHyOuaJILkeY, eUibEHoHyOuaJIhfvXy

A: HyOuaJI
****
Q: hQIQRqbFSnsbvMY, MexnOIQRqbFSfLAgpbz

A:
IQRqbFS
****