#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using ld=long double;
const ll INF=(1ll<<60);
#define rep(i,n) for (ll i=0;i<(ll)(n);i++)
#define all(v) v.begin(),v.end()
template<class T> void chmin(T &a,T b){
    if(a>b){
        a=b;
    }
}
template<class T> void chmax(T &a,T b){
    if(a<b){
        a=b;
    }
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n;
    string s;
    cin >> n >> s;
    vector<ll> dp(n+1,0);
    dp[0]=1;
    rep(i,n){
        if(s[i]=='w'||s[i]=='?'){
            if(i+1<n&&s[i+1]=='a') dp[i+2]|=dp[i];
            if(i+1<n&&s[i+1]=='o') dp[i+2]|=dp[i];
            if(i+1<n&&s[i+1]=='?') dp[i+2]|=dp[i];
        }
        if(s[i]=='n'||s[i]=='?') dp[i+1]|=dp[i];
    }
    if(dp[n]==1) cout << "Yes\n";
    else cout << "No\n";
}