RageQuit

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

namespace RageQuit
{
    class Program
    {
        static void Main(string[] args)
        {
        string input = Console.ReadLine().ToUpper();
        StringBuilder result = new StringBuilder();
        Regex regex = new Regex(@".*?[0-9]+");
        MatchCollection matches = regex.Matches(input);
        foreach (var match in matches)
        {
            string matchOne = match.ToString();
            int count = int.Parse(Regex.Match(matchOne, "[0-9]+").ToString());
            matchOne = Regex.Replace(matchOne, @"[0-9]", "");
            for (int i = 0; i < count; i++)
            {
                result.Append(matchOne);
            }
        }
        Console.WriteLine("Unique symbols used: {0}", Unique(input));
        Console.WriteLine(result);
    }
    public static int Unique(string input)
    {
        input = input.ToUpper();
        Regex rgx = new Regex(@"[0-9]");
        input = rgx.Replace(input, "");
        string unique = new String(input.Distinct().ToArray());
        return unique.Length;
        }
    }
}