List Compare and print - Except, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            
            List<int> first = new List<int>();
            first.Add(1);
            first.Add(2);
            first.Add(3);
            first.Add(7);
            
            List<int> second = new List<int>();
            second.Add(2);
            second.Add(3);
            second.Add(5);
            second.Add(7);
            
            List<int> firstNotSecond = first.Except(second).ToList();
            List<int> secondNotFirst  = second.Except(first).ToList();
 
            Console.WriteLine(firstNotSecond.Count);
                        
            foreach (int i in firstNotSecond) {
                Console.WriteLine("List Items in firstNotSecond {0}", i);
            }
            
            Console.WriteLine(secondNotFirst.Count);
            foreach (int i in secondNotFirst) {
                Console.WriteLine("List Items in secondNotFirst {0}", i);
            }
            
           
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,06 sec, average memory usage: 13 Mb, average nr of threads: 3