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]: sEYtoQlG, XIstoQQPw
[A]: toQ


[Q]: EpTbBxx, AVDTbBbMU
[A]:
TbB