#include <bits/stdc++.h>
using namespace std;
bool match(string S, string T){
  int N = S.size();
  for (int i = 0; i < N; i++){
    if (S[i] != '?' && S[i] != T[i]){
      return false;
    }
  }
  return true;
}
int main(){
  int N;
  cin >> N;
  string S;
  cin >> S;
  vector<bool> dp(N + 1, false);
  dp[0] = true;
  for (int i = 0; i < N; i++){
    if (dp[i]){
      if (match(S.substr(i, 1), "n")){
        dp[i + 1] = true;
      }
      if (i < N - 1){
        if (match(S.substr(i, 2), "wa")){
          dp[i + 2] = true;
        }
        if (match(S.substr(i, 2), "wo")){
          dp[i + 2] = true;
        }
      }
    }
  }
  if (dp[N]){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}