// 2019 IUSB Programming Competition
// Round 1 Problem 4
// Find out if the open and closed parentheses in a string are properly matching
// Solution by Liguo Yu

#include <iostream>
#include <string>
using namespace std;

int main()
{
	bool yes = true;
	
	string input;
	getline(cin, input);
	
	int x = 0;
	
	for (int i = 0; i < input.length(); i++)
	{
		if (input[i] == '(') x++;
		else if (input[i] == ')') x--;
		
		if (x < 0) yes = false;
	}
	
	if (x != 0) yes = false;
	
	if(yes == true) cout << "yes";
	else cout << "no";
	
	return 0;
}