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

VByrCcgcxCfPGDFqIWGloQZTMQf, OqfPGDFqIWGlalTCCkKkMf
fPGDFqIWGl

sHndIbPaygfNvnquxIHeteW, huLmJWXZIgfNvnquxIViQDhbuoL
gfNvnquxI

vGLEuuqvDHVOrko, IuOoNIAQyEuuqvDHVOtecirAP

EuuqvDHVO