#include <bits/stdc++.h>
using namespace std;
vector<string> v(5);
string s1;
int n;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  v[0] = "aeiou";
  v[1] = "eaoui";
  v[2] = "iouea";
  v[3] = "ouaie";
  v[4] = "uieao";
  cin >> n;
  int a1, a2, k, a = 0, ind = 0;
  if (n < 25) {
    cout << "-1\n";
    return 0;
  }
  for (int i = 5; i <= n; i++) {
    k = i;
    if (n % i == 0) {
      a1 = n / i;
      a2 = i;
      if (a1 < 5 || a2 < 5)
        continue;
      else {
        for (int j = 0; j < a1; j++) {
          s1 = v[j % 5];
          for (int k = 0; k < a2; k++) {
            cout << s1[k % 5];
          }
        }
        cout << "\n";
        return 0;
      }
    }
  }
  if (k == n) cout << -1 << '\n';
  return 0;
}
