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

yITbYie, TlqTbYomH
TbY

wXGerDNhSNnCCedyzskswVnh, BfFNhSNnCCedybrUbI
NhSNnCCedy

GggtkuFqpWe, cPlRtkuFqpCSu

tkuFqp