02. Array Modifier

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

namespace ArrayModifier
{
    class Program
    {
        static void Main(string[] args)
        {
            var numbers = Console.ReadLine().Split(' ')
                .Select(int.Parse)
                .ToList();

            string input;

            while ((input = Console.ReadLine()) != "end")
            {
                var tokens = input.Split(' ');
                string command = tokens[0];

                if (command == "decrease")
                {
                    for (int i = 0; i < numbers.Count; i++)
                    {
                        numbers[i]--;
                    }
                }
                else
                {
                    int index1 = int.Parse(tokens[1]);
                    int index2 = int.Parse(tokens[2]);

                    if (command == "swap")
                    {
                        int value = numbers[index1];
                        numbers[index1] = numbers[index2];
                        numbers[index2] = value;
                    }
                    else
                    {
                        numbers[index1] *= numbers[index2];
                    }
                }
            }
            Console.WriteLine(String.Join(", ", numbers));
        }
    }
}