UppercaseLetters

using System;

namespace UppercaseLetters
{
    class UppercaseLetters
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter some text here: ");
            string text = Console.ReadLine();
            string toUpperCase = "";
            int index1 = 0;
            int index2 = 0;
            index1 = text.IndexOf("<up>");
            index2 = text.IndexOf("</up>");
            toUpperCase = text.Substring(index1 + 4, index2 - (index1 + 4));
            text = text.Replace("<up>" + toUpperCase + "</up", toUpperCase.ToUpper());
            Console.WriteLine("The new text is: ");
            Console.WriteLine();
            Console.WriteLine(text);
        }
    }
}