#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n;
    string s;
    cin >> n >> s;
    rep(i,n){
        if(s[i]=='w'){
            if(i==n-1){
                cout << "No\n";
                return 0;
            }
            if(s[i+1]=='o'||s[i+1]=='a'||s[i+1]=='?') i++;
        }else if(s[i]=='?'){
            if(i<n-1 && (s[i+1]=='o'||s[i+1]=='a')) i++;
        }else if(s[i]!='n'){
            cout << "No\n";
            return 0;
        }
    }
    cout << "Yes\n";
    return 0;
}