using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string pw = Console.ReadLine();

        char[] Char = pw.ToCharArray();

        List <char> list = Char.ToList();

        List <char> alpha = new List<char>();

        List <char> alphabig = new List<char>();

        List <char> alphasmall = new List<char>();

        List <char> num = new List<char>();

        List <char> etc = new List<char>();

        for(int i=0 ;i<Char.Length ; i++)

        {

            if((Char[i]>='a' && Char[i]<='z') || (Char[i]>='A' && Char[i]<='Z'))

            {

                alpha.Add(Char[i]);

                if(Char[i]>='A' && Char[i]<='Z')

                    alphabig.Add(Char[i]);

                else if(Char[i]>='a' && Char[i]<='z')

                    alphasmall.Add(Char[i]);

            }

            else if(Char[i]>='0' && Char[i]<='9')

                num.Add(Char[i]);

            else

                etc.Add(Char[i]);

        }

        if(pw.Length>20)

            Console.WriteLine("Invalid");

        else if(alpha.Count>=3 && alpha.Count<=20 && alphabig.Count!=0 && alphasmall.Count!=0 && num.Count!=0 && etc.Count!=0)

            Console.WriteLine("Valid");

        else

            Console.WriteLine("Invalid");

    }

}