#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?","?"};
	for(auto c:s){
		sb+=c;
		if(sb.size()>2){
			cout<<"No"<<endl;
		}
		if(find(ss.begin(),ss.end(),sb)!=ss.end()){
			sb="";
		}
	}
	cout<<"Yes"<<endl;
	
	
}