Loading the letters into a char-typed SortedSet

using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;

using System.Collections.Generic;
using System.Linq;
using System.Reflection;

class Program
    static void Main()
        var letters = new SortedSet<char>("java2s.com");

        foreach (char c in letters)


The output:

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