P04. Matching_Brackets (C# Shell App Paste)

//Disclaimer: The creator of 'C# Shell (C# Offline Compiler)' is in no way responsible for the code posted by any user.
using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;

namespace CSharp_Shell
{

    public static class Program
    {
        public static void Main()
        {
            var input = Console.ReadLine();
            var stack = new Stack<int>();
            for (int i = 0; i < input.Length; i++)
            {
            var ch = input[i];
            if (ch == '(')
            {
                stack.Push(i);
            }
            else if (ch == ')')
            {
                var startIndex = stack.Pop();
                var contents = input.Substring(
                startIndex, i - startIndex + 1);
                Console.WriteLine(contents);
            }

            }

        }

    }
}