instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza
answer:
QzrfsxRfvI


question:
pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
answer:
FpUjQGiof


question:
gXwuhXJrEdzGOmLSKdK, TohXJrEdzGavU
answer:

hXJrEdzG