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

[Q]: koIZvrJmfKCO, TBvrtjcWIZvrJmfKRZDOE
[A]: IZvrJmfK


[Q]: vISTrmBMpQyanUTSXUCm, dJGyOHMpQyanUTpSb
[A]: MpQyanUT


[Q]: AedXEOrEgvnzF, TVTEOrEgvxKuJgv
[A]:
EOrEgv