#include <bits/stdc++.h>
using namespace std;
string sh = "aeiou";
int main() {
  int n;
  cin >> n;
  int a = -1, b = -1;
  for (int i = 5; i * i <= n; i++) {
    if (n % i == 0 && i >= 5 && n / i >= 5) {
      a = i;
      b = n / i;
      break;
    }
  }
  if (a < 5 || b < 5) {
    printf("-1\n");
    return 0;
  }
  vector<vector<char> > rec(a + 1, vector<char>(b + 1));
  for (int i = 1; i <= a; i++) {
    int cnt = 0;
    for (int j = 1; j <= b; j++) {
      rec[i][j] = sh[cnt];
      cnt = (cnt + 1) % 5;
    }
    char c = sh[0];
    sh = sh.substr(1) + c;
  }
  for (int i = 1; i <= a; i++) {
    for (int j = 1; j <= b; j++) {
      printf("%c", rec[i][j]);
    }
  }
  printf("\n");
}
