#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int n; string s; cin >> n >> s;
  const auto is_c = [&](const int i, const char c) -> bool {
    return s[i] == c || s[i] == '?';
  };
  vector<int> dp(n + 1, false);
  dp[0] = true;
  REP(i, n) {
    if (dp[i]) {
      if (i + 1 < n && is_c(i, 'w') && (is_c(i + 1, 'a') || is_c(i + 1, 'o'))) dp[i + 2] = true;
      if (is_c(i, 'n')) dp[i + 1] = true;
    }
  }
  cout << (dp[n] ? "Yes\n" : "No\n");
  return 0;
}