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

[Q]: rRmkmETbjzCzZZxihrVdefxfcenJ, ogQtzAgWjKCzZZxihrVdRswMCmngp
[A]: CzZZxihrVd


[Q]: hCRsCCOoLMpjXwI, lVRCOoLMpxaYFbY
[A]: COoLMp


[Q]: RdtfArUUBCGBPklX, ldGsNfeUBCGBPkMmreGdD
[A]:
UBCGBPk