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

[Q]: UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW
[A]: bmsXkKQuzN


[Q]: yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO
[A]: tAmwMwcIR


[Q]: sjbErk, tabETG
[A]:
bE