typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n;
    std::cin >> n;
    string s;
    std::cin >> s;
    // waon 0123
    vector<vector<bool>> dp(n+1,vector<bool>(4));
    dp[0][3]=true;
    for (int i = 0; i < n; i++) {
        if(s[i]=='w'){
            dp[i+1][0] = dp[i][1]||dp[i][2]||dp[i][3];
        }else if(s[i]=='a'){
            dp[i+1][1] = dp[i][0];
        }else if(s[i]=='o'){
            dp[i+1][2] = dp[i][0];
        }else if(s[i]=='n'){
            dp[i+1][3] = dp[i][1]||dp[i][2]||dp[i][3];
        }else if(s[i]=='?'){
            dp[i+1][0] = dp[i][1]||dp[i][2]||dp[i][3];
            dp[i+1][1] = dp[i][0];
            dp[i+1][2] = dp[i][0];
            dp[i+1][3] = dp[i][1]||dp[i][2]||dp[i][3];
        }
    }
    bool ok = false;
    for (int i = 1; i < 4; i++) {
        ok = ok || dp[n][i];
    }
    if(ok){
        std::cout << "Yes" << std::endl;
    }else{
        std::cout << "No" << std::endl;
    }
}