#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, flag = 0, a, b;
  cin >> n;
  for (int i = 5; i <= n / 5; i++) {
    if (n % i == 0 && n / i >= 5) {
      flag = 1;
      a = i;
      b = n / i;
      break;
    }
  }
  if (flag == 0) {
    cout << "-1";
    return 0;
  }
  char ar[5][5] = {{'a', 'e', 'i', 'o', 'u'},
                   {'e', 'i', 'o', 'u', 'a'},
                   {'i', 'o', 'u', 'a', 'e'},
                   {'o', 'u', 'a', 'e', 'i'},
                   {'u', 'a', 'e', 'i', 'o'}};
  string s;
  char br[a][b];
  for (int i = 0; i < a; i++) {
    for (int j = 0; j < b; j++) {
      br[i][j] = ar[i % 5][j % 5];
      s += br[i][j];
    }
  }
  cout << s;
  return 0;
}
