#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  int K;
  cin >> K;
  char v[5] = {'a', 'e', 'i', 'o', 'u'};
  int row = 0, col = 0;
  for (int i = 5; i <= sqrt(K) + 1; ++i)
    if (K % i == 0 && K / i >= 5) {
      row = i;
      col = K / i;
      break;
    }
  if (row == 0 && col == 0) {
    cout << -1 << endl;
    return 0;
  }
  for (int i = 0, offset = 0; i < row; ++i, offset = (offset + 1) % 5)
    for (int j = offset, k = 0; k < col; ++k, ++j) cout << v[j % 5];
  cout << endl;
  return 0;
}
