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

[Q]: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL
[A]: HMpUYADGfE


[Q]: trHTzJpm, aCHTzVVA
[A]: HTz


[Q]: pZyGDZzcdhxu, gCohVyGDZzcCvLSbg
[A]:
yGDZzc