Join Lists

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

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputFirst = Console.ReadLine();
            string inputSecond = Console.ReadLine();
            string[] arrayFirst = inputFirst.Split(' ');
            string[] arraySecond = inputSecond.Split(' ');
            List<int> final = new List<int>();
            int counter = 0;
            for (int i = 0; i < arrayFirst.Length; i++)
            {
             final.Add(int.Parse(arrayFirst[i]));
             counter++;
            }
            for (int i = 0; i < arraySecond.Length; i++)
            {
             final.Add(int.Parse(arraySecond[i]));
             counter++;
            }
            final.Sort();
            bool b = false;
            while (b != true)
            {
                b = true;
                int p = 0;
                for (int i = 0; i < counter - 1; i++)
            {
                if (final[i] == final[i + 1])
                {
                    final.RemoveAt(i);
                    counter--;
                }
                p = counter;
            }
                for (int j = 0; j < p - 1; j++)
                {
                    if (final[j] == final[j + 1])
                    {
                        b = false;
                    }
                }
            }
            foreach (var item in final)
            {
                Console.Write(item + " ");
            }


            }
        }
    }