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

[Q]: HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA
[A]: uGhWByFlzI


[Q]: YRNpKFPGzUsgCOBJgbVG, TdEpMngFPGzUsgCOZykYRrLp
[A]: FPGzUsgCO


[Q]: EnYvltfyfv, bNYvltDKzW
[A]:
Yvlt