#include <bits/stdc++.h>
using namespace std;
char out[5][6] = {"aeiou", "eioua", "iouae", "ouaei", "uaeio"};
int main() {
  int n, i;
  cin >> n;
  for (i = 5; i * i <= n; i++) {
    if (n % i == 0) {
      int yu = n / i;
      for (int j = 0; j < i; j++) {
        for (int k = 0; k < yu; k++) cout << out[j % 5][k % 5];
      }
      cout << endl;
      return 0;
    }
  }
  cout << -1;
}
