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

[Q]: SQNzngllNbOkKDK, MijfNzngllNDfWge
[A]: NzngllN


[Q]: cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT
[A]: MXjGMNi


[Q]: HGrDaaJKuajqvQU, HlJKuajqvykDZKrk
[A]:
JKuajqv