#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    int n;
    string s;
    cin >> n >> s;
    auto match = [](string s, string t) {
        for (int i = 0; i < s.size(); i++) {
            if (s[i] != t[i] && s[i] != '?' && t[i] != '?') {
                return false;
            }
        }
        return true;
    };
    vector<bool> dp(n + 1);
    dp[0] = true;
    for (int i = 0; i < n; i++) {
        if (!dp[i]) {
            continue;
        }
        if (s[i] == 'n') {
            dp[i + 1] = true;
        }
        if (i < n - 1 &&
            (match(s.substr(i, 2), "wa") || match(s.substr(i, 2), "wo"))) {
            dp[i + 2] = true;
        }
    }
    cout << (dp[n] ? "Yes" : "No") << endl;
}