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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);

    int N;
    cin >> N;
    string S;
    cin >> S;

    auto match = [&](string s, string p) -> bool {
        assert(s.size() == p.size());
        for (int i = 0; i < (int)s.size(); i++) {
            if (s[i] == p[i] || s[i] == '?') { continue; }
            return false;
        }
        return true;
    };

    vector<string> patterns = {"wa", "wo", "n"};

    // dp[i] := S[0,i) が wawon 文字列であるか否か
    vector<bool> dp(N + 1);
    dp[0] = true;
    for (int i = 0; i < N; i++) {
        if (not dp[i]) { continue; }
        for (auto p : patterns) {
            int n = p.size();
            if (i + n <= N && match(S.substr(i, n), p)) {
                dp[i + n] = true;
            }
        }
    }
    string ans = (dp[N] ? "Yes" : "No");
    cout << ans << '\n';

    return 0;
}