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

int dp[200200];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    string S;
    cin >> N >> S;
    dp[0] = 1;
    for(int i = 0; i < N; i++) {
        if(!dp[i]) continue;
        if(S[i] == 'n' || S[i] == '?') {
            dp[i+1] = 1;
        }
        if(S[i] == 'w' || S[i] == '?') {
            if(i+1 < N && (S[i+1] == '?' || S[i+1] == 'o' || S[i+1] == 'a')) {
                dp[i+2] = 1;
            }
        }
    }
    cout << ((dp[N])?"Yes":"No") << "\n";
}