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

[Q]: yrIDSuVuQU, UXTSuVuLcch
[A]: SuVu


[Q]: NNpkdhvgT, BMkAkdhvrwV
[A]: kdhv


[Q]: RLXpVlhuGSLIKKri, QkpVlhuGSkAsQrrf
[A]:
pVlhuGS