#include <bits/stdc++.h>
using namespace std;
int main() {
  int k;
  cin >> k;
  if (k < 25)
    cout << -1;
  else {
    int n = 0, m = 0;
    for (int i = 5; i <= sqrt(k); i++)
      if (k % i == 0) {
        n = i;
        m = k / i;
        if (m > 4) break;
      }
    if (m < 5)
      cout << -1;
    else {
      char* a = new char[k];
      int c[5] = {'a', 'e', 'i', 'o', 'u'};
      int vt = 0;
      for (int i = 0; i < n; i++) {
        int j = 0;
        for (; j < 5; j++) {
          a[i * m + j] = c[vt++];
          vt = vt % 5;
        }
        for (; j < m; j++) a[i * m + j] = c[vt];
        vt = (vt + 1) % 5;
      }
      for (int i = 0; i < k; i++) cout << a[i];
    }
  }
  return 0;
}
