using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var input = "999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999";

        var output = GetConsoleMessage(input);

        Console.WriteLine(output);

    }

    public static string GetConsoleMessage(string variableValue)

    {

        int intVal;

        var isIntParseResultOk = int.TryParse(variableValue, NumberStyles.None, CultureInfo.InvariantCulture, out intVal);

        if (isIntParseResultOk)

            return "Int: " + intVal.ToString();

        double doubleVal;

        var isDoubleParseResultOk = double.TryParse(variableValue, NumberStyles.Any, CultureInfo.InvariantCulture, out doubleVal);

        if (isDoubleParseResultOk)

            return "Double: " + doubleVal.ToString();

        return "String: " + variableValue;

    }

}