instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
VByrCcgcxCfPGDFqIWGloQZTMQf, OqfPGDFqIWGlalTCCkKkMf
answer:
fPGDFqIWGl


question:
haOsaSQcyodWhqQaC, BKLEUQcyodWhvVkmxBz
answer:
QcyodWh


question:
KmAvqqvoDjAgeytHymzeOEdImU, NrDjAgeytHyag
answer:

DjAgeytHy