#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){

    int N;
    string S;
    cin >> N >> S;

    for (int i=0; i<N; i++){
        if (S[i] != '?' && S[i] != 'w' && S[i] != 'o' && S[i] != 'n'){
            cout << "No" << endl;
            return 0;
        }
    }

    for (int i=0; i<N; i++){
        if (S[i] == 'w'){
            if (i == N-1){
                cout << "No" << endl;
                return 0;
            }
            if (S[i+1] != 'o' && S[i+1] != 'a' && S[i+1] != '?'){
                cout << "No" << endl;
                return 0;
            }
        }
        else if (S[i] == 'o'){
            if (i == 0){
                cout << "No" << endl;
                return 0;
            }
            if (S[i-1] != 'w'){
                cout << "No" << endl;
                return 0;
            }
        }
        else if (S[i] == 'a'){
            if (i == 0){
                cout << "No" << endl;
                return 0;
            }
            if (S[i-1] != 'w'){
                cout << "No" << endl;
                return 0;
            }
        }
        else if (S[i] == '?'){
            if (i > 0 && (S[i-1] == 'w')){
                S[i] = 'a';
            }
            else if (i < N-1 && (S[i+1] == 'o' || S[i+1] == 'a')){
                S[i] = 'w';
            }
            else S[i] = 'n';
        }
    }

    cout << "Yes" << endl;

    return 0;
}