#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n;
  cin >> n;
  auto r = 0, c = 0;
  for (auto i = 1; i <= n; ++i) {
    if (n % i) continue;
    if (i >= 5 && n / i >= 5) {
      r = i, c = n / i;
      break;
    }
  }
  if (r == 0) {
    cout << -1 << endl;
    return;
  }
  auto V = string("aeiou");
  auto C = vector<vector<char>>(r, vector<char>(c, '.'));
  for (auto i = 0; i < r; ++i) {
    for (auto j = 0; j < c; ++j) {
      C[i][j] = V[(i + j) % 5];
    }
  }
  for (auto i = 0; i < r; ++i) {
    for (auto j = 0; j < c; ++j) {
      cout << C[i][j];
    }
  }
}
int main() {
  cin.sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  solve();
  return 0;
}
