#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<set>
#include<queue>
using namespace std;
using ll = long long;


int main(){
    int n;
    cin>>n;
    string s;
    cin>>s;
    vector<int> dp(n+1,0);
    dp[0] = 1;
    for(int i = 0;i<n;i++) if(dp[i]){
        if(s[i]=='n'||s[i]=='?') dp[i+1] = 1;
        if(i==n-1) continue;
        if(!(s[i]=='?'||s[i]=='w')) continue;
        if(!(s[i+1]=='?'||s[i+1]=='o'||s[i+1]=='a')) continue;
        dp[i+2] = 1;
    }
    cout<<(dp[n]?"Yes\n":"No\n");

}