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

[Q]: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL
[A]: HMpUYADGfE


[Q]: FQAznAuFjoBKRKB, hPmtFFPnuAznAuFjoBKTgkeJyjcd
[A]: AznAuFjoBK


[Q]: ucdfWSOclHP, GLvzOfWSOcwmKqm
[A]:
fWSOc