#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  bool found = false;
  int numa;
  int numb;
  for (int i = 5; i < n; i++) {
    if (n % i == 0) {
      if (n / i >= 5) {
        numa = i;
        numb = n / i;
        found = true;
        break;
      }
    }
  }
  if (!found) {
    cout << "-1";
    return 0;
  }
  string x = "aeiou";
  for (int i = 0; i < numa; i++) {
    for (int j = 0; j < numb; j++) {
      cout << x[j % 5];
    }
    swap(x[4], x[3]);
    swap(x[3], x[2]);
    swap(x[2], x[1]);
    swap(x[1], x[0]);
  }
}
