#include <iostream>
using namespace std;
int main(){
	int n;cin>>n;
	string s;cin>>s;
	for(int i = 0; n > i; i++){
		if(s[i] == '?' && s[i+1] == '?')continue;
		if((s[i] == '?' || s[i] == 'w') && (s[i+1] == 'a' || s[i+1] == 'o' || s[i+1] == '?')){
			i++;
			continue;
		}
		if(s[i] == '?' || s[i] == 'n'){
			continue;
		}
		cout << "No" << endl;
		return 0;
	}
  cout << "Yes" << endl;
}