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