import re
_octet = r'(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)'
IPv4   = re.compile(rf'^{_octet}\.{_octet}\.{_octet}\.{_octet}$')
IPv6   = re.compile(r'^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$')

def classify(addr):
    if IPv4.fullmatch(addr):
        return "IPv4"
    if IPv6.fullmatch(addr):
        return "IPv6"
    return "Neither"
    
N = int(input())
for _ in range(N):
    line = input()
    print(classify(line))