using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Simple Calculator");

        Console.WriteLine("Enter first nubmer then hit Enter: ");

        var stringNum1 = Console.ReadLine();

        var num1 = 0;

        Int32.TryParse(stringNum1, out num1);

        Console.WriteLine("Enter second nubmer then hit Enter: ");

        var stringNum2 = Console.ReadLine();

        var num2 = 0;

        Int32.TryParse(stringNum2, out num2);

        Console.WriteLine("Enter the arithmetic operation \n(A) for addition \n(S) for Subtraction \n(M) for Multiplication \n(D) for division then hit Enter: ");

        var operation = Console.ReadLine();

        DoTheMath(num1, num2, operation.ToLower());

    }

    public static void DoTheMath(float num1, float num2, string operation)

    {

        if (operation.Contains("a"))

        {

            Console.WriteLine(num1.ToString() + "+" + num2 + "=" + (num1 + num2));

        }

        else if (operation.Contains("s"))

        {

            Console.WriteLine(num1.ToString() + "-" + num2 + "=" + (num1 - num2));

        }

        else if (operation.Contains("m"))

        {

            Console.WriteLine(num1.ToString() + "*" + num2 + "=" + (num1 * num2));

        }

        else if (operation.Contains("d"))

        {

            Console.WriteLine(num1.ToString() + "/" + num2 + "=" + (num1 / num2));

        }

    }

}