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

int main() {
	int N;
	string s;
	cin >> N >> s;
	auto f = []( string s1, string s2 )
	{
		int sz = s1.size();
		for( int i = 0; i < sz; i++ ) {
			if( s1[i] == '?' ) continue;
			if( s1[i] != s2[i] ) return 0;
		}
		return 1;
	};
	vector<string> w{ "wa", "wo", "n" };
	int i = N;
	string last;
	while( i ) {
		int k = -1;
		for( int j = 0; j < 3; j++ ) {
			int sz = w[j].size();
			if( i >= sz && f( s.substr(i - sz, sz), w[j] ) ) {
				k = sz;
				break;
			}
		}
		if( k < 0 ) {
			if( last == "??" ) {
				i++;
				continue;
			}
			cout << "No" << endl;
			return 0;
		}
		last = s.substr(i - k, k);
		i -= k;
	}
	cout << "Yes" << endl;
}