#include <bits/stdc++.h>
using namespace std;
int factor(int n) {
  for (int i = 5; i <= n / 2; i++) {
    if (n % i == 0 && n / i >= 5) {
      return (i);
    }
  }
  return -1;
}
int main() {
  int n;
  cin >> n;
  int k = factor(n);
  if (k == -1) {
    cout << "-1";
    return 0;
  } else {
    int row = k;
    int col = n / k;
    string a[5] = {"aeiou", "eioua", "iouae", "ouaei", "uaeio"};
    char a1[5] = {'a', 'e', 'i', 'o', 'u'};
    for (int i = 0; i < col; i++) {
      for (int j = 0; j < (row / 5); j++) cout << a[i % 5];
      for (int j = 0; j < (row % 5); j++) {
        string m = a[i % 5];
        cout << m[j];
      }
    }
  }
}
