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

oKZCAErEMqzODnkcNqxVdoBOC, yHzRJuSqzODnkcNqxExr
qzODnkcNqx

UIjAMFDuxDDGkfQa, VdsHuxDDGkfZHZZ
uxDDGkf

MgTFbTUvIwihRYaDwZuABj, FqvIlFbTUvIwihRrGfm

FbTUvIwihR