#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
#define REP(i,n) for(int i=0;i<int(n);i++)


int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	int i,j,k;

	int N;
	string S;
	cin >> N >> S;

	S+='x';

	REP(i,N) if(S[i]!='w' && S[i]!='a' && S[i]!='o' && S[i]!='n' &&S[i]!='?'){
		cout << "No" << endl;
		return 0;
	}

	if(N==1 && S[0]!='n' && S[0]!='?'){
		cout << "No" << endl;
		return 0;
	}

	if(S[0]=='a' || S[0]=='o' || S[N-1]=='w'){
		cout << "No" << endl;
		return 0;
	}

	for(i=1;i<N;i++) if(S[i]=='a'){
		if(S[i-1]=='w') continue;
		else if(S[i-1]=='?') S[i-1]='w';
		else{
			cout << "No" << endl;
			return 0;
		}
	}

	for(i=1;i<N;i++) if(S[i]=='o'){
		if(S[i-1]=='w') continue;
		else if(S[i-1]=='?') S[i-1]='w';
		else{
			cout << "No" << endl;
			return 0;
		}
	}

	REP(i,N) if(S[i]=='w'){
		if(S[i+1]!='a' && S[i+1]!='o' && S[i+1]!='?'){
			cout << "No" << endl;
			return 0;
		}
	}


	cout << "Yes" << endl;


	return 0;
}