#include <bits/stdc++.h>
using namespace std;
int main() {
  int k, n;
  cin >> k;
  string a = "aeiou";
  for (n = 5; n * n <= k && k % n != 0; n++)
    ;
  int m = k / n;
  if (k % n != 0 || m < 5) {
    cout << "-1" << endl;
  } else {
    for (int i = 0; i < k; i++) {
      cout << a[(i % m + i / m) % 5];
    }
  }
  return 0;
}
