Four-digit number

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

namespace _06FourDigitNumber
{
    class FourDigitNumber
    {
        static void Main()
        {
            Console.Write("Enter a four-digit number: ");
            int a = Console.Read() - '0';
            int b = Console.Read() - '0';
            int c = Console.Read() - '0';
            int d = Console.Read() - '0';
            Console.WriteLine("Sum of numbers: {0}", a + b + c + d);
            Console.WriteLine("Reversed order: {0}{1}{2}{3}", d, c, b, a);
            Console.WriteLine("Last digit in front: {0}{1}{2}{3}", d, a, b, c);
            Console.WriteLine("Second and third digit exchanged: {0}{1}{2}{3}", a, c, b, d);
        }
    }
}