#include<bits/stdc++.h>
using namespace std;
int main()
{
	char s;
	int a = 0,c = 0;
		while(1)
		{
			s = getchar();
			if (s == '@')
			{
				if(c == 0)
				{
					cout<<"YES";
				}
				else
				{
					cout<<"NO";
				}
				break;
			}
			
			if (s == ')')
			{
				c--;
			}
			if (s == '(')
			{
				c++;
			}
			if (c < 0)
			{
				cout<<"NO";
				break;
			}
			if (a == 0&&s == ')')
			{
				cout<<"NO";
				break;
			}
		}
	return 0;
}