instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
wDSKHtWbCDqTeoBeiYHdcZD, MydQCwqTeoBeiYHdYMp
answer:
qTeoBeiYHd

question:
ssKUiWgGqsXYlFOOc, JDcVTmCgGqsXYlxYE
answer:
gGqsXYl

question:
hDUAlGKFzM, EHkDfUAlGKYviJ
answer:
UAlGK