#include<stack>
char x;
using namespace std;
int main(){
	int l=0, r=0;
	stack<char>a;
	while (1) {
		cin >> x;
			if (x == '@') {
				break;
		}
		if (x=='(') {
			a.push(x);
			l++;
		}
		else if (x == ')') {
			r++;
			if (a.top() == '(') {
				a.pop();
			}
		}
	}

	if (r == l && a.empty()) {
		cout << "YES"<<endl;
	}
	else {
		cout << "NO"<<endl;
	}
system("pause");
return 0;
}