03. Rage Quit

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace RageQuit
{
    class Program
    {
        static void Main()
        {
            string user = Console.ReadLine().ToUpper();
            Regex test = new Regex(@"(\D+)(\d+)");
            StringBuilder result = new StringBuilder();
            foreach (Match a in test.Matches(user))
            {
                StringBuilder res = new StringBuilder();
                string txt = a.Groups[1].Value;
                int repeat = int.Parse(a.Groups[2].Value);
                for (int i = 0; i < repeat; i++)
                {
                    res.Append(txt);
                }
                result.Append(res);
            }
            Console.WriteLine("Unique symbols used: {0}",result.ToString().Distinct().Count());
            Console.WriteLine(result);
        }
    }
}