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

namespace _08._Balanced_Parenthesis
{
    class Program
    {
        static void Main(string[] args)
        {
            // 1 stack for opening brackets, 1 queue for closing brackets;
            // {, }, (, ), [, ]. possible parenthesis.

            var input = Console.ReadLine();

            var openingStack = new Stack<char>();
            var closingQueue = new Queue<char>();

            for (int i = 0; i < input.Length; i++)
            {
                char currentBracket = input[i];

                if (currentBracket == '{' || currentBracket == '(' || currentBracket == '[')
                {
                    openingStack.Push(currentBracket);
                }
                else if (currentBracket == '}' || currentBracket == ')' || currentBracket == ']')
                {
                    closingQueue.Enqueue(currentBracket);
                }
            }


            while (openingStack.Any())
            {
                int endIndex = openingStack.Count;
                bool isTrue = true;

                for (int i = 0; i < endIndex; i++)
                {
                    char openingBracket = openingStack.Pop();
                    char closingBracket = closingQueue.Dequeue();
                    bool trueMatch = openingBracket == '{' && closingBracket == '}' ||
                        openingBracket == '(' && closingBracket == ')' ||
                        openingBracket == '[' && closingBracket == ']';

                    if (!trueMatch)
                    {
                        isTrue = false;
                        break;
                    }
                }
                if (isTrue == false)
                {
                    Console.WriteLine("NO");
                    break;
                }
                else if (isTrue)
                {
                    Console.WriteLine("YES");
                    break;
                }
            }

        }
    }
}