#include <bits/stdc++.h>
using namespace std;
const long long maxn = 100;
string v[maxn];
long long cn[26];
char mp[101][10000];
signed main() {
  long long n;
  cin >> n;
  string ts = "aouie";
  for (long long i = 5; i < n && n / i >= 5; i++) {
    if (n % i) continue;
    for (long long j = 0; j < i; j++)
      for (long long l = 0; l < n / i; l++) mp[j][l] = ts[(j + l) % 5];
    for (long long j = 0; j < i; j++) {
      for (long long l = 0; l < n / i; l++) cout << mp[j][l];
    }
    return 0;
  }
  cout << -1;
  return 0;
}
