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"""

wiki: https://en.wikipedia.org/wiki/IPv4

Is IP v4 address valid?

A valid IP address must be four octets in the form of A.B.C.D,

where A, B, C and D are numbers from 0-255

for example: 192.168.23.1, 172.255.255.255 are valid IP address

192.168.256.0, 256.192.3.121 are invalid IP address

"""

def is_ip_v4_address_valid(ip: str) -> bool:

"""

print "Valid IP address" If IP is valid.

print "Invalid IP address" If IP is invalid.

>>> is_ip_v4_address_valid("192.168.0.23")

True

>>> is_ip_v4_address_valid("192.256.15.8")

False

>>> is_ip_v4_address_valid("172.100.0.8")

True

>>> is_ip_v4_address_valid("255.256.0.256")

False

>>> is_ip_v4_address_valid("1.2.33333333.4")

False

>>> is_ip_v4_address_valid("1.2.-3.4")

False

>>> is_ip_v4_address_valid("1.2.3")

False

>>> is_ip_v4_address_valid("1.2.3.4.5")

False

>>> is_ip_v4_address_valid("1.2.A.4")

False

>>> is_ip_v4_address_valid("0.0.0.0")

True

>>> is_ip_v4_address_valid("1.2.3.")

False

>>> is_ip_v4_address_valid("1.2.3.05")

False

"""

octets = ip.split(".")

if len(octets) != 4:

return False

for octet in octets:

if not octet.isdigit():

return False

number = int(octet)

if len(str(number)) != len(octet):

return False

if not 0 <= number <= 255:

return False

return True

if __name__ == "__main__":

ip = input().strip()

valid_or_invalid = "valid" if is_ip_v4_address_valid(ip) else "invalid"

print(f"{ip} is a {valid_or_invalid} IPv4 address.")

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