#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using db = double;
using pll = pair<ll, ll>;
const int MOD = 1e9 + 7, INF = INT_MAX, N = 1e5 + 10;
int main() {
  ll n, temp1, temp2;
  cin >> n;
  ll flag = 0;
  for (ll i = 1; i <= n / 2; i++) {
    if (n % i == 0) {
      temp1 = n / i;
      if (temp1 >= 5 && i >= 5) {
        flag = 1;
        temp2 = i;
        break;
      }
    }
  };
  if (!flag) {
    cout << -1 << endl;
  } else {
    char rec[5] = {'a', 'e', 'i', 'o', 'u'};
    string res;
    for (ll i = 0; i < temp2; i++) {
      res += rec[i % 5];
    };
    for (ll i = 0; i < temp1; i++) {
      ll cnt = 0;
      for (ll j = i; cnt < temp2; j++) {
        cout << res[j % temp2];
        cnt++;
      }
    }
    cout << endl;
  }
  return 0;
}
