using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = ReadLine();
        WriteLine(Wawon(n, s) ? "Yes" : "No");
    }
    static bool Wawon(int n, string _s)
    {
        var s = _s.ToCharArray();
        for (var i = 0; i < n; ++i)
        {
            if (s[i] == 'w')
            {
                if (i + 1 == n) return false;
                if (s[i + 1] == '?') s[i + 1] = 'a';
            }
            else if (s[i] == 'a' || s[i] == 'o')
            {
                if (i == 0) return false;
                if (s[i - 1] == '?') s[i - 1] = 'w';
            }
        }
        for (var i = 0; i < n; ++i)
        {
            if (s[i] == 'w')
            {
                if (s[i + 1] != 'a' && s[i + 1] != 'o') return false;
                ++i;
            }
            else if (s[i] != '?' && s[i] != 'n') return false;
        }
        return true;
    }
}