import java.io.*;
import java.util.*;
import java.util.regex.*;
public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

    String range255="(\\d{1,2}|[01][0-9][0-9]|[2][0-5][0-5])\\.";
    Pattern ipv4=Pattern.compile("^"+range255+range255+range255+range255);
    String rangeHexa="(\\.{4}|((\\.{3})?)[0-9_a-fA-F]|((\\.{2})?)[0-9_a-fA-F]{2}|((\\.?)[0-9_A-Fa-f]{3})|([0-9_a-fA-F]{4})):";
    Pattern ipv6=Pattern.compile("^"+rangeHexa+rangeHexa+rangeHexa+
    rangeHexa+rangeHexa+rangeHexa+rangeHexa+rangeHexa);
    Scanner sc= new Scanner(System.in);
    String line="";
    sc.nextLine();
    while(sc.hasNext()){
       line=sc.nextLine();
        if(ipv4.matcher(line+".$").find()){
            System.out.println("IPv4");
        }
        else if(ipv6.matcher(line+":$").find()){
            System.out.println("IPv6");
        }
        else
            System.out.println("Neither");
    }
}
}