import ipaddress
import requests
import json 

x = input()

res = requests.get('https://www.gstatic.com/ipranges/goog.json')
response = json.loads(res.text)

ipv4Prefix = [x['ipv4Prefix'] for x in filter(lambda x: 'ipv4Prefix' in x, response["prefixes"])]

for prefix in ipv4Prefix:
    isInPrefix = ipaddress.ip_address(x) in ipaddress.ip_network(prefix)

    if isInPrefix:
        print(x, 'is subnet of', prefix)
        exit()

print('not found')