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

[Q]: inquDFuJxtBaaFGCaRzO, NYcnWDuDFuJxtBafxZWCUw
[A]: uDFuJxtBa


[Q]: fWJdaAfOCfejXZvidHM, gOpfOCfejXZbtLvSLZI
[A]: fOCfejXZ


[Q]: xmAATjEhjtdxFntVdOX, DWuNZYlOjtdxFntVdExUbVze
[A]:
jtdxFntVd