#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int r, c;
  bool check = false;
  for (int i = 5; i < n; i++) {
    if (n % i == 0) {
      if (n / i >= 5) {
        check = true;
        r = i;
        c = n / i;
        break;
      }
    }
  }
  if (!check) {
    cout << -1 << endl;
  } else {
    string s = "aeiou";
    char res[2000][2001];
    for (int i = 0; i < 5; i++) {
      for (int j = 0; j < 5; j++) {
        res[i][j] = s[(i + j) % 5];
      }
    }
    for (int i = 0; i < 5; i++) {
      for (int j = 5; j < c; j++) {
        res[i][j] = s[i];
      }
    }
    for (int i = 5; i < r; i++) {
      for (int j = 0; j < c; j++) {
        res[i][j] = s[(i + j) % 5];
      }
    }
    for (int i = 0; i < r; i++) {
      for (int j = 0; j < c; j++) {
        cout << res[i][j];
      }
    }
  }
}
