class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            bool cowSequence = true;
            if (str[0] != '1')
            {
                cowSequence = false;
            }
            string checkStr = str.Substring(1);
            if (cowSequence)
            {
                for(int i = 0; i < 10; i++)
                {
                    if(i == 3)
                    {
                        continue;
                    }
                    if(checkStr.IndexOf(i.ToString())!= -1)
                    {
                        cowSequence = false ;
                    }
                }
            }
            if (cowSequence)
            {
                Console.WriteLine(str.Length - 1);
            }
            else
            {
                Console.WriteLine("-1");
            }
        }
    }