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

[Q]: ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
[A]: UKLTNLJbMK


[Q]: JjEQVKijeyEQ, dwSVKijeywCTvb
[A]: VKijey


[Q]: jdZhuMhko, dAZhuMhda
[A]:
ZhuMh