#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000 * 1000 * 1000 + 7;
const double PI = 3.14159265;
int main() {
  int k;
  cin >> k;
  int flag = 0;
  int len, dum;
  for (int i = 5; i < k; ++i) {
    if (k % i == 0) {
      flag++;
      len = i;
      dum = k / i;
      if (dum < 5) {
        flag = 0;
      }
      break;
    }
  }
  if (!flag) {
    cout << -1 << "\n";
    return 0;
  } else {
    char a[len][dum];
    char c[5] = {'a', 'e', 'i', 'o', 'u'};
    for (int i = 0; i < len; ++i) {
      for (int j = 0; j < dum; ++j) {
        int dum1 = (i + j) % 5;
        a[i][j] = c[dum1];
      }
    }
    for (int i = 0; i < len; ++i) {
      for (int j = 0; j < dum; ++j) {
        cout << a[i][j];
      }
    }
  }
}
