# Write a function to open and read data from http://cs1110.cs.virginia.edu/code/access.log.
# Use a regular expression to find IP addresses
#
# The function will return a list of all IP addresses. If the same IP address appears multiple times,
# only one should be reported.
#

import urllib.request
import re


def count_IP_addresses(url):












print(count_IP_addresses("http://cs1110.cs.virginia.edu/code/access.log"))