using System;

class FourDigitNumber
{
    static void Main()
        {
            Console.WriteLine("Please enter the number:");
            string number = Console.ReadLine();
            int myParse = int.Parse(number);
            Console.WriteLine("Entered number is: {0}", myParse);
            int total = int.Parse(number[0].ToString()) + int.Parse(number[1].ToString()) + int.Parse(number[2].ToString()) + int.Parse(number[3].ToString());
            Console.WriteLine("The sum of {0} is: {1}", number, total);
            char[] arraySymbols = number.ToCharArray();
            char buffer = arraySymbols[3];
            arraySymbols[3] = arraySymbols[0];
            arraySymbols[0] = buffer; //1012
            buffer = arraySymbols[1];
            arraySymbols[1] = arraySymbols[2]; //2011 <-> 1102 <-> 1012
            arraySymbols[2] = buffer;
            Console.Write("Reversed number is: ");
            Console.WriteLine(arraySymbols); //1102 -> 1201
            buffer = arraySymbols[1];//
            arraySymbols[1] = arraySymbols[3];
            arraySymbols[3] = buffer;
            Console.Write("Last digit in front: "); //1201 -> 2101 (*6987*) - > 9786
            Console.WriteLine(arraySymbols);
            buffer = arraySymbols[0];
            arraySymbols[0] = arraySymbols[1];
            arraySymbols[1] = arraySymbols[3];
            arraySymbols[3] = buffer;
            Console.Write("Second and third digits exchanged: ");
            Console.WriteLine(arraySymbols);
        }
}