#include <atcoder/all>
#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using namespace std;
using namespace atcoder;
using namespace boost::multiprecision;
using ll = long long;
using mint = modint998244353;
#define all(v) v.begin(), v.end()
#define rep(a, b) for(long long a = 0; a < (long long)(b); a++)
int op(int a, int b) { return min(a, b); }
int e() { return 2147483647; }

int main() {
    int N;
    string S;
    cin >> N >> S;
    rep(i, N) {
        if(S[i] == 'n')
            continue;
        if(i != N-1 && (S[i+1] == 'a' || S[i+1] == 'o')){
            i++;
            continue;
        }
        if(S[i] == '?')
            continue;
        if(S[i] == 'w') {
            if(i == N - 1) {
                cout << "No" << endl;
                return 0;
            }
            if(S[i + 1] == 'a' || S[i + 1] == 'o' || S[i + 1] == '?') {
                i++;
                continue;
            }
            cout << "No" << endl;
            return 0;
        }
        cout << "No" << endl;
        return 0;
    }
    cout << "Yes" << endl;
}