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

//嘘解法？もしかしたら正当性あり

int main()
{
	int N;
	cin >> N;
	string S;
	cin >> S;

	bool ok = true;
	vector<string> A = {"wan","won","nwa","nwo","nnn"};
	set<string> st;
	rep(i,5) rep(b,1<<3)
	{
		string a = A[i];
		rep(j,3) if(b>>j&1) a[j] = '?';
		st.insert(a);
	}

	for(int i = 0; i<N-2; i+=2)
	{
		string T = S.substr(i,3);
		if(!st.count(T)) ok = false;
	}
	cout << (ok?"Yes":"No") << endl;
}