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

OBzHWjmkcgVGPyv, gCHWjmkcgVMq
HWjmkcgV

JjEQVKijeyEQ, dwSVKijeywCTvb
VKijey

NlehHGwgeMzbbifV, ZLwgeMzbbicHeyvDyP

wgeMzbbi