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

IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs
BqdPcXfHot

IobjElBjKvpepE, kRulBjKvvxU
lBjKv

ogSPAOCzTFlefTtQgBvWCfzUr, VBRpzTFlefTtQCC

zTFlefTtQ