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

[Q]: uqDaPS, XyDaMZ
[A]: Da


[Q]: yJRITYgVTSNsPjG, NSIdKYgVTSNmj
[A]: YgVTSN


[Q]: mOjJywEEkchqZnNXozPAzxnzw, fqIHBjtEkchqZnNXyXh
[A]:
EkchqZnNX