instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
AeYjeKwZQillzpD, SnqviKwZQillrxuTB
answer:
KwZQill


question:
CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU
answer:
DeNZwCPbJ


question:
EzvSkXlGfhbZIL, IurfXlGfhbByALN
answer:

XlGfhb