#include<bits/stdc++.h>
using namespace std;
int main(){
  int N; string S;
  cin >> N >> S;
  vector<vector<bool>> dp(N+1, vector<bool>(4, false));
  map<char,int> M;
  M['w'] = 0; M['a'] = 1; M['o'] = 2; M['n'] = 3;
  dp[0][0] = dp[0][1] = dp[0][2] = dp[0][3] = true;
  for(int i = 0; i < N; i++){
    for(int j = 0; j < 4; j++){
      if(dp[i][j]){
        if(j==0){
          dp[i+1][1] = (S[i]=='a'||S[i] == '?');
          dp[i+1][2] = (S[i]=='o'||S[i] == '?');
        } else {
          dp[i+1][0] = (S[i]=='w'||S[i] == '?');
          dp[i+1][3] = (S[i]=='n'||S[i] == '?');
        }
      }
    }
  }
  cout << (dp[N][1] || dp[N][2] || dp[N][3] ? "Yes":"No") << endl;
}