using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication57
{
    class Program
    {
        static public bool equals_sign_check(string str, int i)
        {

            if (str[i] == '=')
            {
                if (i - 1 >= 0)
                    if (str[i - 1] == '=' || str[i - 1] == '<' || str[i - 1] == '>')
                        return true;
               if (i + 1 < str.Length)
                     if (str[i + 1] == '=')
                         return true;
                    return false;
            }
            else
                return false;
        }
        static public bool CountBrackets(string str)
        {
            int open = 0;
            int close = 0;
            for (int i = 0; i < str.Length; ++i)
                if (str[i] == '(')
                    ++open;

            for (int i = 0; i < str.Length; ++i)
                if (str[i] == ')')
                    ++close;
            if (open == close)
                return true;
            else
                return false;
        }
        static string alph = "qwertyuiopasdfghjklzxcvbnm";
        static string valid = "&|<>()";
        static public bool Validate(string str)
        {
            if (str == "")
                return false;
            for (int i = 0; i < str.Length; ++i)
                if (!((alph.Contains(str[i]) || valid.Contains(str[i]) || equals_sign_check(str, i)) && CountBrackets(str)))
                    return false;
            return true;

        }
        static void Main(string[] args)
        {
            string line = Console.ReadLine();
            Console.WriteLine(Validate(line));
        }
    }
}