#pragma region Macros
#include <bits/stdc++.h>
#include <atcoder/all>
#if defined(LOCAL) || defined(_DEBUG)
#include "debug.hpp"
#else
#define O(...)
#define START()
#define STOP()
#define MEMORY()
#endif
using namespace std;
#define REP(i, n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REPR(i, n) for(int i=(n); i>=0; --i)
#define FOR(i, n, m) for(int i=(m), i##_len=(n); i<i##_len; ++i)
#define EACH(i, v) for(const auto& i : v)
#define ALL(x) (x).begin(),(x).end()
#define ALLR(x) (x).rbegin(),(x).rend()
template<class T, class U>bool chmax(T &a, const U &b) { if (a<(T)b) { a=(T)b; return 1; } return 0; }
template<class T, class U>bool chmin(T &a, const U &b) { if (b<(T)a) { a=(T)b; return 1; } return 0; }
#define vec vector
#define umap unordered_map
#define uset unordered_set
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Tup = tuple<ll, ll, ll>;
using vl = vec<ll>;
#define fi first
#define se second
#define el endl
constexpr ll INF = numeric_limits<ll>::max()/2-1;

template<class T>
istream &operator>>(istream &stream, vec<T>& o){REP(i, o.size())stream >> o[i];return stream;}
#define I(T, ...) ;T __VA_ARGS__;__i(__VA_ARGS__);
void __i() {}
template<class T, class... Ts> void __i(T&& o, Ts&&... args){cin >> o;__i(forward<Ts>(args)...);}
#pragma endregion

void Main();

int main(){
    std::cin.tie(nullptr);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    MEMORY();
    return 0;
}

bool dp[(int)2e5+10][2];
bool seen[(int)2e5+10][2];
bool rec(string &s, ll i, bool isw) {
    if(s.size() == i) {
        return isw == false;
    }

    auto &res = dp[i][isw];
    if(seen[i][isw]) return res;
    seen[i][isw] = true;
    res = 0;
    if(isw && s[i] != 'w' && s[i] != '?') {
        return false;
    }
    switch(s[i]) {
    case '?':
        res |= rec(s, i+1, false);
        if(!isw) res |= rec(s, i+1, true);
        break;
    case 'a':
    case 'o':
        res |= rec(s, i+1, true);
        break;
    case 'w':
        if(!isw) return false;
    case 'n':
        res |= rec(s, i+1, false);
        break;
    default:
        return false;
    }
    return res;
}

void Main(){
    I(ll, n);
    I(string, s);
    reverse(ALL(s));
    cout << (rec(s, 0, false) ? "Yes" : "No") << el;
}