Array_Matcher

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _04.Array_Matcher
{
    class Array_Matcher
    {
        static void Main(string[] args)
        {
            string[] array = Console.ReadLine().Split('\\');
            string[] newArray = new string[array.Length];
            char[] array1 = array[0].ToCharArray();
            char[] array2 = array[1].ToCharArray();
            List<char> result = new List<char>();
            for (int i = 0; i < array.Length-1; i++)
            {
                if (array[2] == "join")
                {
                    foreach (var item in array1)
                    {
                        if (array2.Contains(item))
                        {
                            result.Add(item);
                        }
                    }
                }
                else if (array[2]== "left exclude")
                {
                    foreach (var item in array2)
                    {
                        if (!array1.Contains(item))
                        {
                            result.Add(item);
                        }
                    }
                }
                else
                {
                    foreach (var item in array1)
                    {
                        if (!array2.Contains(item))
                        {
                            result.Add(item);
                        }
                    }
                }
            }
            result.Sort();
            Console.WriteLine(string.Join("", result.Distinct()));
        }
    }
}