#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int e = 1;
  string s;
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == 'a' || s[i] == 'e' || s[i] == 'i' || s[i] == 'o' ||
        s[i] == 'u' || s[i] == 'n')
      continue;
    else {
      if (!(s[i + 1] == 'a' || s[i + 1] == 'e' || s[i + 1] == 'i' ||
            s[i + 1] == 'o' || s[i + 1] == 'u'))
        e = 0;
    }
  }
  if (e)
    cout << "YES";
  else
    cout << "NO";
}
