#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using vll =vector<ll>;
using vvll =vector<vll>;
#define rep(i,n) for(ll i=(ll)(0); i<(ll(n)); ++i)
#define all(x) (x).begin(), (x).end()

int main(){
    ll N;
    string S;
    cin>>N>>S;
    vector<vector<bool>> DP(N+1,vector<bool>(2));
    DP[0][0]=1;
    rep(i,N){
        if(DP[i][0]){
            if(S[i]=='?'||S[i]=='n'){
                DP[i+1][0]=1;
            }
            if(S[i]=='?'||S[i]=='w'){
                DP[i+1][1]=1;
            }
        }
        if(DP[i][1]){
            if(S[i]=='?'||S[i]=='a'||S[i]=='o'){
                DP[i+1][0]=1;
            }
        }
    }
    cout<<(DP[N][0]?"Yes":"No")<<endl;
}