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

//噓解法(サンプルAC)

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

	bool ok = true;
	rep(i,N-1)
	{
		string T = S.substr(i,2);
		if(i<N-2 && T[1]=='?' && S[i+2]=='a') ok = false;
		if(i<N-2 && T[1]=='?' && S[i+2]=='o') ok = false;
		if(T=="aw" || T=="ow" || T=="wn") ok = false;
	}
	cout << (ok?"Yes":"No") << endl;
}