#include <bits/stdc++.h>
using namespace std;
long long power(long long x, long long y, long long p) {
  long long res = 1;
  x = x % p;
  while (y > 0) {
    if (y & 1) res = (res * x) % p;
    y = y >> 1;
    x = (x * x) % p;
  }
  return res;
}
long long prime(long long num) {
  for (long long i = 5; i <= sqrt(num); i++) {
    if (num % i == 0) return i;
  }
  return 0;
}
int main() {
  long long n;
  cin >> n;
  if (prime(n) == 0) {
    cout << -1 << endl;
  } else {
    long long temp = prime(n);
    vector<char> v = {'a', 'e', 'i', 'o', 'u'};
    long long pos = 0;
    for (long long i = 0; i < (n / temp); i++) {
      pos = i;
      for (long long j = 0; j < temp; j++) {
        if (pos >= 5) pos = 0;
        cout << v[pos];
        pos++;
      }
    }
    cout << endl;
    ;
  }
}
