using System;
using System.Linq;

namespace MyCompiler {
    class Program {
        public static void Main(string[] args) 
        {
            DigitCount(221333);
            DigitCount(136116); 
            DigitCount(3410515780);
            DigitCount(24677734541);
            DigitCount(79825929634);
            DigitCount(36123594675);
            DigitCount(2);
        }
        
        public static void DigitCount(long num)
        {
            string[] str = num.ToString().Select(x => num.ToString().Count(y => y ==x).ToString()).ToArray();
            Console.WriteLine(string.Join("",str));
        }
    }
}

Embed on website

To embed this project on your website, copy the following code and paste it into your website's HTML: