#include<bits/stdc++.h>
using namespace std;
int main(){
  int T;
  //cin >> T;
  T = 1;
  while(T--){
    int N; string S;
    cin >> N >> S;
    vector<vector<bool>> dp(N+1, vector<bool>(26, false));
    dp[0]['n'-'a'] = true;
    for(int i = 0; i < N; i++)
      for(int j = 0; j < 26; j++){
        if(dp[i][j]){
          if(j=='w'-'a'){
            dp[i+1]['a'-'a'] = (S[i]=='a'||S[i] == '?');
            dp[i+1]['o'-'a'] = (S[i]=='o'||S[i] == '?');
          } else {
            dp[i+1]['w'-'a'] = (S[i]=='w'||S[i] == '?');
            dp[i+1]['n'-'a'] = (S[i]=='n'||S[i] == '?');
          }
        }
      }
    cout << (dp[N]['a'-'a'] || dp[N]['o'-'a'] || dp[N]['n'-'a'] ? "Yes":"No") << endl;
  }
}