#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  for (int i = 0; i < s.length(); i++) {
    if (s[i] != 'a' && s[i] != 'e' && s[i] != 'i' && s[i] != 'o' &&
        s[i] != 'u' && s[i] != 'n') {
      if (i != s.length() - 1) {
        if (s[i + 1] != 'a' && s[i + 1] != 'e' && s[i + 1] != 'i' &&
            s[i + 1] != 'o' && s[i + 1] != 'u') {
          cout << "NO" << endl;
          return 0;
        }
      } else {
        cout << "NO" << endl;
        return 0;
      }
    }
  }
  cout << "YES" << endl;
  return 0;
}
