Four-Digit Num Operations

using System;
using System.Linq;

namespace ConsoleTest
{
    class ConsoleTest
    {
        static void Main()
        {
            int input = int.Parse(Console.ReadLine());
            int[] digits = input.ToString().ToCharArray().Select(x => (int)Char.GetNumericValue(x)).ToArray();
            int sumOfDigits = 0;
            for (int i = 0; i < digits.Length; i++)
            {
                sumOfDigits += digits[i];
            }
            Console.WriteLine("Sum of digits:" + sumOfDigits);
            Console.WriteLine("Reversed:" + digits[3] + digits[2] + digits[1] + digits[0]);
            Console.WriteLine("Last digit in front:" + digits[3] + digits[0] + digits[1] + digits[2]);
            Console.WriteLine("Exchange second and third digits:" + digits[0] + digits[2] + digits[1] + digits[3]);
        }
    }
}