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

[Q]: fdinRdwwlntwqzYGhV, ZefonRdwwlntoWQbh
[A]: nRdwwlnt


[Q]: fBpRXPkikQokGVeS, FwUbKXkikQokGos
[A]: kikQokG


[Q]: gfEWFv, CLEWff
[A]:
EW