//mosyasu

#include <bits/stdc++.h>
using namespace std;

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

    vector<vector<bool>> dp(N, vector<bool>(26, false));
    if(S[0]=='?') for(int j = 0; j<26; j++) dp[0][j] = true; // S == "?..."
	if(S[0]=='n') dp[0]['n'-'a'] = true; // S == "n..."
	if(S[0]=='w') dp[0]['w'-'a'] = true; // S == "w..."
    if(S[0]=='a') // S == "a..."
    {
		cout << "No" << endl;
		return 0;
	}
	if(S[0]=='o') // S == "o..."
	{
		cout << "No" << endl;
		return 0;
	}

    for(int i = 1; i<N; i++) for(int j = 0; j<26; j++) if(dp[i-1][j]==true)
    {
        if(j=='w'-'a')
        {
            if(S[i]=='a') dp[i]['a'-'a'] = true; // w -> a
            if(S[i]=='o') dp[i]['o'-'a'] = true; // w -> o
            if(S[i]=='?')
            {
                dp[i]['a'-'a'] = true; // w -> a
                dp[i]['o'-'a'] = true; // w -> o
            }
        }
        else
        {
            if(S[i]=='w') dp[i]['w'-'a'] = true; // a -> w,  o -> w,  n -> w
            if(S[i]=='n') dp[i]['n'-'a'] = true; // a -> n,  o -> n,  n -> n
            if(S[i]=='?')
            {
                dp[i]['w'-'a'] = true; // a -> w,  o -> w,  n -> w
                dp[i]['n'-'a'] = true; // a -> n,  o -> n,  n -> n
            }
        }
    }

    bool ans = false;
    if(dp[N-1]['a'-'a']) ans = true; // S == "...a"
    if(dp[N-1]['o'-'a']) ans = true; // S == "...o"
    if(dp[N-1]['n'-'a']) ans = true; // S == "...n"

    if(ans==true) cout << "Yes" << endl;
    else cout << "No" << endl;
}