#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i=0;i<n;i++)

int main(){
	int n;
	cin>>n;
	string s;
	cin>>s;
	vector<int> dp(n+1);
	dp[0]=1;
	rep(i,n)if(dp[i]){
		if(i+1<n)if(s[i]=='?'||s[i]=='w')if(s[i+1]=='?'||s[i+1]=='a')dp[i+2]=1;
		if(i+1<n)if(s[i]=='?'||s[i]=='w')if(s[i+1]=='?'||s[i+1]=='o')dp[i+2]=1;
		if(s[i]=='n')dp[i+1]=1;
	}
	cout<<(dp[n]?"Yes":"No")<<endl;
}