#include <bits/stdc++.h>
using namespace std;
long long a, b, c, n, ans, cn1, cn2, cn3, t;
string s, s1, s2;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  cin >> t;
  if (t < 25) {
    cout << -1 << endl;
    return 0;
  }
  int row = 0;
  int col = 0;
  for (int i = 5; i <= t / 2; i++) {
    if (t % i == 0) {
      row = t / i;
      col = i;
      break;
    }
  }
  if (row < 5 || col < 5) {
    cout << -1 << endl;
    return 0;
  }
  char arr[row][col];
  s = "aeiou";
  for (int i = 0; i < row; i++) {
    for (int j = 0; j < col; j++) {
      if ((i + j) % 5 == 0)
        arr[i][j] = 'a';
      else
        arr[i][j] = s[(i + j) % 5];
    }
  }
  s1 = "";
  for (int i = 0; i < row; i++) {
    for (int j = 0; j < col; j++) {
      s1 += arr[i][j];
    }
  }
  cout << s1 << endl;
  cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << "s.\n";
  return 0;
}
