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

[Q]: yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO
[A]: tAmwMwcIR


[Q]: uGDJixAmSiVaFRmfKRM, NsTGxsJixAmSiVageSw
[A]: JixAmSiVa


[Q]: JONJGjLdEqFDfHg, xEEYojLdEqSDsIO
[A]:
jLdEq