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

[Q]: GlAYDsKQoXy, IxDsKQuK
[A]: DsKQ


[Q]: DZfOjrQffR, CXOjrQQc
[A]: OjrQ


[Q]: zdsawoOnoNzHwLsidTmhTjMKS, INOoIbyKzHwLsidTmhNNtouFwFRW
[A]:
zHwLsidTmh