#include <bits/stdc++.h>
using namespace std;
int main() {
  string vowels = "aeiou";
  int N, row, col;
  cin >> N;
  bool ok = false;
  for (int i = 5; i < N; i++) {
    if (N % i == 0 && i >= 5 && N / i >= 5) {
      ok = true;
      row = i;
      col = N / i;
    }
  }
  if (!ok) {
    cout << -1;
    return 0;
  }
  for (int i = 0; i < row; i++) {
    for (int j = 0; j < col; j++) {
      cout << vowels[(i + j) % 5];
    }
  }
  return 0;
}
