#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 5;
const int MXN = 3e5 + 5;
const long long LMXN = 1e14;
const int MOD = 1e9 + 7;
long long cs = 0;
void solve() {
  int n;
  cin >> n;
  int a = -1, b = -1;
  for (int i = 2; i <= sqrt(n); i++) {
    if (n % i == 0 && i >= 5 && n / i >= 5) {
      a = i, b = n / i;
      break;
    }
  }
  if (a == -1 || b == -1) {
    cout << -1 << "\n";
    return;
  }
  string s = "aeiou";
  string ans;
  for (int i = 0; i < a; i++) {
    for (int j = 0; j < b; j++) {
      ans += s[(i + j) % 5];
    }
  }
  cout << ans << "\n";
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t = 1;
  while (t--) {
    solve();
  }
  return 0;
}
