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

UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW
bmsXkKQuzN

hCRsCCOoLMpjXwI, lVRCOoLMpxaYFbY
COoLMp

dMvujBylWfqSH, JPeQBylWfZKGMs

BylWf