instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv
answer:
dAdXQfQCAm


question:
cUCQXEFSgRZjK, RYdvUQXEFSgRZVlwx
answer:
QXEFSgRZ


question:
VCBpjcgVaeNLaBqFJneYSqDINI, ByIRYeueNLaBqFJnTaLN
answer:

eNLaBqFJn