#include <bits/stdc++.h>
using namespace std;
#define MAX(a,b) (a > b ? a : b)
#define MIN(a,b) (a < b ? a : b)
#define PI 3.14159
#define PHI 1.61803
#define ll long long
int main() {
    
    vector<char> a;
    char b;
    int top = 0;
    while(1){
        cin >> b;
        if(b == '@'){
            break;
        }else if(b == '('){
            a.push_back('(');
            top++;
        }else if(b == ')'){
            if(top > 0){
                a.pop_back();
            }else{
                cout << "NO";
                return 0;
            }
        }
    }
    if(a.size() == 0){
        cout << "YES";
    }else{
        cout << "NO";
    }
    
    return 0;
}