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

[Q]: wXGerDNhSNnCCedyzskswVnh, BfFNhSNnCCedybrUbI
[A]: NhSNnCCedy


[Q]: lMRuEThD, wqQRuEKp
[A]: RuE


[Q]: OolczVSLyXLavcPJyfrDeRNWnf, xUBdyXLavcPJyfIlI
[A]:
yXLavcPJyf