#include <iostream>
#include <vector>

int main()
{
    std::ios::sync_with_stdio(false); // 入力の高速化

    int N;
    std::cin >> N;
    std::string S;
    std::cin >> S;

    std::vector<std::vector<bool>> dp(N, std::vector<bool>(26, false));

    if (S[0] == '?') {
        for (int j = 0; j < 26; j++) {
            dp[0][j] = true;
        }
    }
    else if (S[0] == 'n') {
        dp[0]['n' - 'a'] = true;
    }
    else if (S[0] == 'w') {
        dp[0]['w' - 'a'] = true;
    }
    else if (S[0] == 'a' || S[0] == 'o') {
        std::cout << "No" << std::endl;
        return 0;
    }

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

    bool ans = dp[N - 1]['a' - 'a'] || dp[N - 1]['o' - 'a'] || dp[N - 1]['n' - 'a'];

    if (ans) {
        std::cout << "Yes" << std::endl;
    }
    else {
        std::cout << "No" << std::endl;
    }

    return 0;
}