// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
using vl = vector<ll>;
using vvl = vector<vl>;
using P = pair<ll,ll>;
#define pb push_back
#define int long long
#define double long double
#define INF (ll) 3e18
// Ctrl + Shift + B コンパイル
// Ctrl + C 中断
// ./m 実行


signed main(){
  int n; cin >> n;
  string s; cin >> s;
  rep(i,n) if (s[i] == 'o') s[i] = 'a';
  while(s.size()){
    if (s.size() == 1) if (s.back() == 'n') {s.pop_back(); continue;}
    if (s.size() == 1) if (s.back() == '?') {s.pop_back(); continue;}
    if (s.size() >= 2){
      if (s.back() == 'n') {s.pop_back(); continue;}
      if (s.substr(s.size()-2) == "wa") {s.pop_back(); s.pop_back(); continue;}
      if (s.substr(s.size()-2) == "w?") {s.pop_back(); s.pop_back(); continue;}
      if (s.substr(s.size()-2) == "?a") {s.pop_back(); s.pop_back(); continue;}
      if (s.substr(s.size()-2) == "??") {s.pop_back(); continue;}
    }
    cout << "No" << endl;
    return 0;
  }
  cout << "Yes" << endl;
}