#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, r, c;
  bool possible = false;
  char arr[] = {'a', 'e', 'i', 'o', 'u'};
  cin >> n;
  if (n >= 25) {
    for (int i = 5; i <= ceil(sqrt(n)); i++) {
      if (n % i == 0 && n / i >= 5) {
        r = i;
        c = n / i;
        possible = true;
        break;
      }
    }
  } else
    possible = false;
  if (possible) {
    for (int i = 0; i < r; i++) {
      for (int j = 0; j < c; j++) {
        cout << arr[(i + j) % 5];
      }
    }
  } else
    cout << -1;
  cout << endl;
  return 0;
}
