public static void Main()
var symbols = "ABCDEF0123456789".ToDictionary(c => c, c => 0);
for (int i = 0; i < 1000; i++)
Guid.NewGuid().ToString().ToUpper().Replace("-", "").ToList().ForEach(c => {if (symbols.ContainsKey(c)) symbols[c]++;});
var ordered = symbols.OrderByDescending(d => d.Value);
foreach (var item in ordered)
Console.WriteLine("Rank: " + (++rank) + " - Letter: " + (item.Key.ToString()) + " - Count: " + (item.Value));