#include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
	string s,sb;
	
	cin >> n >>s;
	vector<string>ss{"wa","wo","n","?a","?o","w?","?wa","?wo","?n","??"};
	for(auto c:s){
		sb+=c;
		cout<<sb<<endl;

		if(sb.size()>3){
			cout<<"No"<<endl;
			return 0;
		}
		if(find(ss.begin(),ss.end(),sb)!=ss.end()){
			sb="";
		}
	}
	if(sb.empty()||sb=="?")
	cout<<"Yes"<<endl;
	else
	cout<<"No"<<endl;
	
	
}