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

[Q]: lLxXqKscqizXTO, TqrKscqizutDudo
[A]: Kscqiz


[Q]: AkYuNemHGBEDF, uluNemHGAycbWX
[A]: uNemHG


[Q]: RHeuqqlVLVPEcUAlyosUpe, CdfqlVLVPEcUAPISpHRT
[A]:
qlVLVPEcUA