#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

int main() {
  int N; cin >> N;
  string S; cin >> S;
  int i = 0;
  while (i < N) {
    if (S[i] == 'w') {
      if (i < N - 1) {
        if (S[i + 1] == 'a' || S[i + 1] == 'o' || S[i + 1] == '?') {
          i += 2;
          continue;
        } 
      }
      cout << "No" << endl;
      return 0;
    } else if (S[i] == 'n') {
      i++;
      continue;
    } else if (S[i] == '?') {
      while (i < N) {
        if (S[i] != '?') break;
        i++;
      }
      if (i >= N) break;
      if (S[i] == 'w') continue;
      if (S[i] == 'a' || S[i] == 'o' || S[i] == 'n') {
        i++;
        continue;
      }
      cout << "No" << endl;
      return 0;
    } else {
      cout << "No" << endl;
      return 0;
    }
  } 
  cout << "Yes" << endl;
  return 0;
}