// your code goes here
function processData(input) {
    const ipAddresses = input.split('\n').slice(1);
    const regex = {
        ipv4: /^((1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.){3}(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])$/,
        ipv6: /^([\da-f]{1,4}:){7}[\da-f]{1,4}$/
    }
    const answer = ipAddresses.map(ipaddr =>
        regex.ipv4.test(ipaddr) ? 'IPv4' :
            regex.ipv6.test(ipaddr) ? 'IPv6' : 'Neither'
    );
    console.log(answer.join('\n'));
}
 
process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});
 
process.stdin.on("end", function () {
   processData(_input);
});
 

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dGhpcyBpcyBqdW5rIHRleHQuCjEyNy4wLjAuMQoyNTUudnZ2LjMuMw==

this is junk text.
127.0.0.1
255.vvv.3.3