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

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


[Q]: sJRFPufsaWXNeu, AePufsafc
[A]: Pufsa


[Q]: SYIcBdmyQNQbZY, kdSWsMlIcBdmyQNQbUDQ
[A]:
IcBdmyQNQb