using System;
using System.Text.RegularExpressions;

namespace _3s
{
    class izp_3Snow
    {
        static void Main()
        {
            string pattern1 = @"([^a-zA-Z0-9_\s]+)";
            string pattern2 = @"([\d_]+)";
            string pattern3 = @"([^a-zA-Z0-9_\s]+)([\d_]+)([a-zA-Z]+)([\d_]+)([^a-zA-Z0-9_\s]+)";
            //string patternCore = @"([a-zA-Z]+)";

            bool isValid = false;
            string mid = "";

            string l1 = Console.ReadLine();
            string l2 = Console.ReadLine();
            string l3 = Console.ReadLine();
            string l4 = Console.ReadLine();
            string l5 = Console.ReadLine();

            isValid = Regex.IsMatch(l1, pattern1);
            if (isValid == true)
            {
                isValid = Regex.IsMatch(l2, pattern2);
                if (isValid == true)
                {
                    isValid = Regex.IsMatch(l3, pattern3);
                    if (isValid == true)
                    {
                        MatchCollection midM = Regex.Matches(l3, pattern3);
                        foreach (Match item in midM)
                        {
                            mid = item.Groups[3].ToString();
                        }

                        isValid = Regex.IsMatch(l4, pattern2);
                        if (isValid == true)
                        {
                            isValid = Regex.IsMatch(l5, pattern1);
                            if (isValid == true)
                            {
                                Console.WriteLine("Valid");
                                Console.WriteLine(mid.Length);
                            }
                        }
                    }
                }
            }
            else if(isValid == false)
            {
                Console.WriteLine("Invalid");
            }
        }
    }
}