04. Array Matcher

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



class Program
{
    static void Main()
    {
        string [] inp = Console.ReadLine().Split('\\');
        char []  FirstArr = new char [inp[0].Length];
        char[] SecondArr = new char[inp[1].Length];
        List<char> Output = new List<char>();
        string word = "";

        string command = inp[2];
        string firstWord = inp[0];
        string SecondWord = inp[1];
        for (int i = 0; i < firstWord.Length; i++)
        {
            FirstArr[i] = firstWord[i];

        }
        for (int i = 0; i < SecondWord.Length; i++)
        {
            SecondArr[i] = SecondWord[i];


        }
        if (command =="join")
        {
            for (int i = 0; i < FirstArr.Length; i++)
            {
                for (int j = 0; j < SecondArr.Length; j++)
                {
                    if (FirstArr[i] ==SecondArr[j])
                    {
                        word += FirstArr[i];
                    }
                }
            }

        }
        if (command == "right exclude")
        {
            for (int i = 0; i < FirstArr.Length; i++)
            {
                for (int j = 0; j < SecondArr.Length; j++)
                {
                    if (FirstArr[i] == SecondArr[j])
                    {
                        break;
                    }
                    else if (j == SecondArr.Length - 1)
                    {
                        word += FirstArr[i];
                    }
                }
            }
        }
        if (command == "left exclude")
        {
            for (int i = 0; i < SecondArr.Length; i++)
            {
                for (int j = 0; j < FirstArr.Length; j++)
                {
                    if (SecondArr[i] == FirstArr[j])
                    {
                        break;
                    }
                    else if (j == FirstArr.Length - 1)
                    {
                        word+= "" + SecondArr[i];
                    }
                }
            }
        }
        char[] result = word.ToCharArray();
        Array.Sort<char>(result);
        foreach (var item in result)
        {
            Console.Write(item);
        }









    }



    private static void printArr(List<char> FirstArr)
    {
        foreach (var item in FirstArr)
        {
            Console.WriteLine(item);
        }
    }
}