#include <bits/stdc++.h>
using namespace std;
bool compare(pair<int, pair<int, int>> p1, pair<int, pair<int, int>> p2) {
  return p1.second.second > p2.second.second;
}
int main() {
  long long n;
  cin >> n;
  string s = "";
  bool flag = 1;
  long long a = -1, b = -1;
  for (int i = 5; i * i <= n; i++) {
    if (n % i == 0) {
      a = i;
      b = n / i;
      if (b >= 5) {
        flag = 0;
        break;
      }
    }
  }
  string temp = "aeiou";
  if (flag) {
    cout << -1 << "\n";
  } else {
    for (long long i = 0; i < a; i++) {
      for (long long k = i; k < b + i; k++) {
        s += temp[k % 5];
      }
    }
    cout << s << "\n";
  }
  return 0;
}
