#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
#include <iterator>
#include <string>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cmath>
#include <ctime>
#include <iomanip>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <random>
#include <utility>
#include <functional>
using namespace std;
void Main()
{
	int N;
	string S;
	cin >> N >> S;
	const string T[3] = {"wa","wo","n"};
	auto match = [&](int i,int j) -> bool
	{
		string s = S.substr(i,T[j].size());
		for(int k = 0;k < (int)T[j].size();k++)
		{
			if(s[k] != '?' && s[k] != T[j][k])
			{
				return false;
			}
		}
		return true;
	};
	vector<int> dp(N + 1);
	dp[0] = 1;
	for(int i = 0;i < N;i++)
	{
		for(int j = 0;j < 3;j++)
		{
			if(i + T[j].size() <= N && match(i,j))
			{
				dp[i + T[j].size()] |= dp[i];
			}
		}
	}
	cout << (dp[N] ? "Yes\n":"No\n");
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	/* cin >> tt; */
	while(tt--) Main();
}