Balanced Parentheses

using System;
using System.Collections.Generic;
using System.Linq;

namespace P08BalancedParetheses
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine();

            var bracketsStack = new Stack<char>();
            var isBalanced = true;

            if (input.Length % 2 == 0)
            {
                for (int i = 0; i < input.Length; i++)
                {
                    var currentChar = input[i];

                    if (currentChar == '(' ||
                        currentChar == '[' ||
                        currentChar == '{')
                    {
                        bracketsStack.Push(currentChar);
                    }
                    else if (currentChar == ')' ||
                             currentChar == ']' ||
                             currentChar == '}')

                    {
                        if (currentChar == ')' && bracketsStack.Peek() == '(')
                        {
                            bracketsStack.Pop();
                        }
                        else if (currentChar == ']' && bracketsStack.Peek() == '[')
                        {
                            bracketsStack.Pop();
                        }
                        else if (currentChar == '}' && bracketsStack.Peek() == '{')
                        {
                            bracketsStack.Pop();
                        }
                        else
                        {
                            isBalanced = false;
                            break;
                        }
                    }
                }
            }

            else
            {
                isBalanced = false;
            }

            if (isBalanced)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }
        }
    }
}