#include <bits/stdc++.h>
using namespace std;
int main() {
  long int a, b, c, d;
  cin >> a;
  b = sqrt(a);
  for (b; b >= 1; b--) {
    if (a % b == 0) break;
  }
  if (b < 5) {
    cout << -1 << endl;
  } else {
    for (c = 0; c < b; c++) {
      for (d = 0; d < (a / b); d++) {
        if ((c + d) % 5 == 0) {
          cout << "a";
        }
        if ((c + d) % 5 == 1) {
          cout << "e";
        }
        if ((c + d) % 5 == 2) {
          cout << "i";
        }
        if ((c + d) % 5 == 3) {
          cout << "o";
        }
        if ((c + d) % 5 == 4) {
          cout << "u";
        }
      }
    }
  }
}
