#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int i, j, k, a, b, c, n, t, m, f;
  string s;
  vector<long long int> v, vv;
  cin >> n;
  f = 0;
  for (i = 5; i <= sqrt(n); i++) {
    if (n % i == 0) {
      if (n / i >= 5) {
        f = 1;
        c = i;
        b = n / i;
        break;
      }
    }
  }
  if (f == 0) {
    cout << -1 << endl;
  } else {
    a = b - 5;
    cout << "auioe";
    for (j = 1; j <= a; j++) {
      cout << "a";
    }
    cout << "eoaiu";
    for (j = 1; j <= a; j++) {
      cout << "e";
    }
    cout << "ieuao";
    for (j = 1; j <= a; j++) {
      cout << "i";
    }
    cout << "oieua";
    for (j = 1; j <= a; j++) {
      cout << "o";
    }
    cout << "uaoei";
    for (j = 1; j <= a; j++) {
      cout << "u";
    }
    m = i - 5;
    for (k = 1; k <= m; k++) {
      cout << "aeiou";
      for (j = 1; j <= a; j++) {
        cout << "x";
      }
    }
    cout << endl;
  }
  return 0;
}
