#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  string a;
  cin >> a;
  char vowels[5] = {'a', 'e', 'i', 'o', 'u'};
  for (int i = 0; i < a.size() - 1; ++i) {
    bool flag = false;
    for (int k = 0; k < 5; ++k) {
      if (a[i] == vowels[k]) {
        flag = true;
        break;
      }
    }
    if (a[i] == 'n') flag = true;
    if (flag) {
      continue;
    }
    for (int k = 0; k < 5; ++k) {
      if (a[i + 1] == vowels[k]) {
        flag = true;
        break;
      }
    }
    if (flag == false) {
      cout << "NO" << endl;
      return 0;
    }
  }
  int n = a.size();
  bool flag = false;
  for (int k = 0; k < 5; ++k) {
    if (a[n - 1] == vowels[k]) {
      flag = true;
      break;
    }
  }
  if (a[n - 1] == 'n') flag = true;
  if (flag == true)
    cout << "YES" << endl;
  else
    cout << "NO";
  return 0;
}
