#include <bits/stdc++.h>
using namespace std;
char A[5] = {'a', 'e', 'i', 'o', 'u'};
int main() {
  int k;
  cin >> k;
  int rol = 0, col = 0;
  for (int i = 5; i <= sqrt(k); ++i) {
    if ((k % i == 0) && (k / i >= 5)) {
      rol = i;
      col = k / i;
      break;
    }
  }
  if (rol == 0) {
    cout << -1;
  } else {
    for (int i = 1; i <= rol; ++i) {
      for (int j = 0; j < col; ++j) {
        cout << A[(i + j) % 5];
      }
    }
  }
}
