using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

namespace P10Rage_Quit
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string regex = @"([^0-9]+[0-9]+)";
            var matches = Regex.Matches(regex, input);
            string textReg = @"[^0-9]+";
            string numReg = @"[0-9]+";
            var result = new StringBuilder();

            foreach (Match match in matches)
            {
                string strMatch = match.ToString();
                Match textMatch = Regex.Match(textReg, strMatch);
                Match numberMatch = Regex.Match(numReg, strMatch);
                int number = int.Parse(numberMatch.ToString());

                for (int i = 0; i < number; i++)
                {
                    result.Append(textMatch.ToString());
                }
            }
            string output = result.ToString().ToUpper();

            Console.WriteLine($"Unique symbols used: {output.Distinct().Count()}");
            Console.WriteLine(output);
        }
    }
}