using System;

using System.Collections.Generic;

using System.Collections.Generics.Stack<T>;

public class Program

{

    public static void Main()

    {

        string expression = Console.ReadLine();

        Stack<T> stack = new Stack<T>();

        bool correctBrackets = true;

        for(int index = 0;index < expression.Length;index++)

        {

            char ch = expression[index];

            if(ch == '(')

            {

                stack.Push(index);

            }

            else if(ch == '[')

            {

                stack.Push(index);

            }

            else if(ch == '{')

            {

                stack.Push(index);

            }

            else if(ch == ']')

            {

                if(stack.Count == 0)

                {

                    correctBrackets = false;

                    break;

                }

                stack.Pop();

            }

            else if(ch == '}')

            {

                if(stack.Count == 0)

                {

                    correctBrackets = false;

                    break;

                }

                stack.Pop();

            }

            else if(ch == ')')

            {

                if(stack.Count == 0)

                {

                    correctBrackets = false;

                    break;

                }

                stack.Pop();

            }

        }

        if(stack.Count != 0)

            {

                correctBrackets = false;

            }

        Console.WriteLine("Are the brackets correct? " + correctBrackets);

    }

}