#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

bool check(string s,string t){
	if(s.size()!=t.size())return false;
	rep(i,s.size()){
		if(s[i]=='?'||t[i]=='?')continue;
		if(s[i]!=t[i])return false;
	}
	return true;
}

int main(){
	
	int n;
	cin>>n;
	
	string s;
	cin>>s;
	vector<bool> dp(n+1);
	dp[0] = true;
	rep(i,n){
		if(dp[i]==false)continue;
		if(check(s.substr(i,2),"wa")||check(s.substr(i,2),"wo"))dp[i+2] = true;
		if(check(s.substr(i,1),"n"))dp[i+1] = true;
	}
	cout<<(dp.back()?"Yes":"No")<<endl;
	
	
	return 0;
}