using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var symbols = "ABCDEF0123456789".ToDictionary(c => c, c => 0);

        Enumerable.Range(0, 1000).ToList().ForEach(i => Guid.NewGuid().ToString().ToUpper().Replace("-", "").ToList().ForEach(c => symbols[c]++));

        symbols.OrderByDescending(d => d.Value).ToList().ForEach(s => Console.WriteLine($"Character: {s.Key} | Count: {s.Value}"));

    }

}