array matcher

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

class ArrayMatcher
{
    static void Main()
    {
        string intput = Console.ReadLine();
        string[] splitedInput = intput.Split('\\');

        var array1 = splitedInput[0];
        var array2 = splitedInput[1];

        var newArray1 = array1.Except(array2);
        string[] sortedArray1 = newArray1.Select(c => c.ToString()).ToArray();
        Array.Sort(sortedArray1,StringComparer.Ordinal);

        var newArray2 = array2.Except(array1);
        string[] sortedArray2 = newArray2.Select(c => c.ToString()).ToArray();
        Array.Sort(sortedArray2,StringComparer.Ordinal);

        var bothArrays = array1 + array2;
        var set = new HashSet<string>();
        var duplicates = bothArrays
                                .GroupBy(i => i)
                                .Where(g => g.Count() > 1)
                                .Select(g => g.Key);


        string[] sortedArrays = duplicates.Select(c => c.ToString()).ToArray();
        Array.Sort(sortedArrays,StringComparer.Ordinal);

        if (splitedInput[2] == "join")
        {
            foreach (var ch in sortedArrays)
            {
                Console.Write(ch);
            }
            Console.WriteLine();
        }
        else if (splitedInput[2] == "right exclude")
        {
            foreach (var ch in sortedArray1)
            {

                Console.Write(ch);
            }
            Console.WriteLine();
        }
        else if (splitedInput[2] == "left exclude")
        {
            foreach (var ch in sortedArray2)
            {
                Console.Write(ch);
            }
            Console.WriteLine();
        }
    }
}