#include <bits/stdc++.h>
using namespace std;
int main() {
  int k;
  cin >> k;
  string v[5] = {"a", "u", "e", "i", "o"};
  for (int i = 5; i * i <= k; i++) {
    if (k % i == 0) {
      int n = k / i;
      int m = k / n;
      string ans = "";
      for (int x = 0; x < n; x++)
        for (int y = 0; y < m; y++) ans += v[(x + y) % 5];
      cout << ans << endl;
      return 0;
    }
  }
  cout << -1 << endl;
  return 0;
}
