#include <bits/stdc++.h>
#define rep(i,a,n) for(int i = a; i < n; i++)
#define yes (cout << "Yes" << endl)
#define YES (cout << "YES" << endl)
#define no (cout << "No" << endl)
#define NO (cout << "NO" << endl)
#define pb push_back
#define pf push_front
#define mp make_pair
#define ALL(a)  (a).begin(),(a).end()
using namespace std;
using ll = long long;
using ull = unsigned long long;
using vi = vector<int>;
using vs = vector<string>;
using Graph = vector<vector<int>>;
const int mod = 998244353;
const int MOD = 1000000007;
int dight_sum(int t) {
    int ans = 0;
    while(t >= 10) {
        ans += t % 10;
        t /= 10;
    }
    ans += t;
    return ans;
}
vector<bool> seen;
void dfs(const Graph &G, int v) {
    seen[v] = true; // v を訪問済にする

    // v から行ける各頂点 next_v について
    for (auto next_v : G[v]) { 
        if (seen[next_v]) continue; // next_v が探索済だったらスルー
        dfs(G, next_v); // 再帰的に探索
    }
}

int main () {
    int n;
    cin >> n;
    string s;
    cin >> s;
    string t;
    rep(i,0,n) {
        if(s[i] != 'n') {
            t += s[i];
        }
    }
    rep(i,0,t.size()) {
        if(t[i] == 'a' || t[i] == 'o' || t[i] == 'w' || t[i] == '?') {
            t += "";
        }
        else {
            no;
            return 0;
        }
    }
    rep(i,0,t.size()) {
        if(t[i] == 'a' || t[i] == 'o') {
            if(i == 0) {
                no;
                return 0;
            }
            else {
                if(t[i - 1] != 'w' && t[i - 1] != '?' ){
                    no;
                    return 0;
                }
            }
        }
    }
    yes;
}