#include <bits/stdc++.h>
using namespace std;
void input(int n, int a[]) {
  for (int i = 0; i < n; ++i) cin >> a[i];
}
long long bin_expo(long long A, long long B, long long M) {
  long long res = 1LL;
  while (B > 0) {
    if (B % 2 == 1) {
      res = (res * A) % M;
    }
    A = (A * A) % M;
    B = B / 2;
  }
  return res;
}
int main() {
  int k;
  cin >> k;
  int n = -1, m = -1;
  for (int i = 1; i <= k; i++) {
    if (k % i == 0) {
      if (i >= 5 && (k / i) >= i) {
        n = i;
        m = k / i;
        break;
      }
    }
  }
  if (n == -1) {
    cout << -1 << endl;
    return 0;
  }
  string ans = "";
  int ini = 0;
  vector<char> v = {'a', 'e', 'i', 'o', 'u'};
  for (int i = 0; i < n; i++) {
    int cur = ini;
    for (int j = 0; j < m; j++) {
      ans.push_back(v[cur]);
      cur = (cur + 1) % 5;
    }
    ini = (ini + 1) % 5;
  }
  cout << ans << endl;
  return 0;
}
