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

[Q]: NUuLSmDjCKcJPc, lGGSLIDjCKcJBo
[A]: DjCKcJ


[Q]: JAGuNgaUudP, eojvKNgaUuQg
[A]: NgaUu


[Q]: kfufGJfS, XGeufGWI
[A]:
ufG