#include<iostream>
#include<vector>
#include<cassert>
using namespace std;
int N;
string S;
bool dp[2<<17];
bool f(int idx,char c)
{
	return S[idx]=='?'||S[idx]==c;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin>>N>>S;
	dp[0]=true;
	for(int i=0;i<N;i++)if(dp[i])
	{
		if(i+1<N)
		{//wa
			if(f(i,'w')&&f(i+1,'a'))dp[i+2]=true;
		}
		if(i+1<N)
		{//wo
			if(f(i,'w')&&f(i+1,'o'))dp[i+2]=true;
		}
		{
			if(f(i,'n'))dp[i+1]=true;
		}
	}
	cout<<(dp[N]?"Yes":"No")<<endl;
}