#include <bits/stdc++.h>
using LL = long long;
using namespace std;
using ii = pair<int, int>;
using vi = vector<int>;
using vii = vector<ii>;
int findFac(int n) {
  for (int i = 5; i * i <= n; ++i) {
    if (n % i == 0) {
      return i;
    }
  }
  return -1;
}
int getRow(int n) {
  if (n < 25) {
    return -1;
  }
  int row = findFac(n);
  if (row == -1) {
    return -1;
  }
  return row;
}
int main() {
  int n;
  cin >> n;
  int row = getRow(n);
  int col = n / row;
  if (row == -1) {
    cout << -1 << endl;
    return 0;
  }
  vector<string> _table = {"a", "e", "i", "o", "u"};
  string ans;
  for (int i = (int)0; i < (int)row; ++i) {
    for (int j = (int)0; j < (int)col; ++j) {
      ans += _table[(i + j) % 5];
    }
  }
  cout << ans << endl;
  return 0;
}
