#include <bits/stdc++.h>
using namespace std;
string s = "aeiou";
int main() {
  int n;
  cin >> n;
  if (n < 25) {
    cout << -1;
    return 0;
  }
  int n1 = 0, n2 = 0;
  for (int i = 5; i < n; i++) {
    if (n % i == 0) {
      n1 = i;
      n2 = n / i;
      break;
    }
  }
  if (n1 < 5 || n2 < 5) {
    cout << -1;
    return 0;
  }
  for (int i = 0; i < n1; i++) {
    for (int j = 0; j < n2; j++) cout << s[(i + j) % 5];
  }
  return 0;
}
