#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000000007;
const long long MAX = 10001;
const double PI = 3.1415926;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
  while (t--) {
    int n, x, y;
    x = -1;
    cin >> n;
    for (int i = 1; i * i <= n; ++i) {
      if (n % i == 0 && i >= 5 && n / i >= 5) {
        x = i;
        y = n / i;
        break;
      }
    }
    if (x == -1) {
      cout << -1 << endl;
      return 0;
    }
    string temp = "aeiou";
    int counter = 0;
    for (int i = 0; i < x; ++i) {
      for (int j = 0; j < y; ++j) cout << temp[(counter + j) % 5];
      counter++;
    }
  }
  return 0;
}
