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class Program
{
    static void Main(string[] args)
    { 
        String []chars = {"z", "x", "y", "z", "y"};
        for (int i = 0; i < chars.Length; ++i)
        for (int j = i + 1; j < chars.Length; ++j)
        if(chars[i].CompareTo(chars[j]) == 0)
        Console.WriteLine(chars[j]);
        Console.ReadLine();
    }
}

static void main(String args[])
 {
     char chars[] = {'a', 'b', 'c'};
     String s = new String(chars);
     Console.WriteLine(s);
 }

static void Main(string[] args)
 {
     string s = " i love you";
     Console.WriteLine(s.IndexOf('l') + "  " + s.lastIndexOf('o') + "  " + s.IndexOf('e'));
     Console.ReadLine();
 }