using System;
using System.Text.RegularExpressions;

namespace _03.Snowflake
{
    public class Startup
    {
        public static void Main(string[] args)
        {
            var counter = 1;
            var coreLength = 0;
            for (int i = 0; i < 5; i++)
            {
                var currentInput = Console.ReadLine();
                switch (counter)
                {
                    case 1:
                        if (!IsSurficeValid(currentInput))
                        {
                            PrintInvalidResult();
                            return;
                        }
                        break;
                    case 2:
                        if (!IsMatnleValid(currentInput))
                        {
                            PrintInvalidResult();
                            return;
                        }
                        break;
                    case 3:

                        var pattern = new Regex(@"^[^A-Za-z0-9]+[0-9_]+([A-Za-z]+)[0-9_]+[^A-Za-z0-9]+");
                        var match = pattern.Match(currentInput);
                        if (match.Success)
                        {
                           coreLength =  match.Groups[1].Length;
                        }
                        else
                        {
                            PrintInvalidResult();
                            return;
                        }
                        break;
                    case 4:
                        if (!IsMatnleValid(currentInput))
                        {
                            PrintInvalidResult();
                            return;
                        }
                        break;
                    case 5:
                        if (!IsSurficeValid(currentInput))
                        {
                            PrintInvalidResult();
                            return;
                        }
                        break;
                }
                counter++;
            }

            if (counter == 6)
            {
                Console.WriteLine("Valid");
                Console.WriteLine(coreLength);
            }
        }

        public static bool IsSurficeValid(string currentInput)
        {
            var pattern = new Regex(@"^[^A-Za-z0-9]");
            var match = pattern.Match(currentInput);

            if (match.Success)
            {
                return true;
            }
            return false;
        }

        public static void PrintInvalidResult()
        {
            Console.WriteLine("Invalid");
        }

        public static bool IsMatnleValid(string currentInput)
        {
            var pattern = new Regex(@"^[0-9_]+");
            var match = pattern.Match(currentInput);

            if (match.Success)
            {
                return true;
            }
            return false;
        }
    }
}