#include <bits/stdc++.h>
using namespace std;
int main() {
  int k, rt, i, j;
  char a[] = {'a', 'e', 'i', 'o', 'u'};
  cin >> k;
  rt = (int)sqrt(k);
  for (; k % rt != 0; rt--)
    ;
  if (rt > 4) {
    for (i = 0; i != k / rt; i++) {
      for (j = 0; j != rt; j++) {
        cout << a[(i + j) % 5];
      }
    }
  } else
    cout << "-1";
}
