#include <bits/stdc++.h>
using namespace std;
int n;
int main() {
  while (~scanf("%d", &n)) {
    int pos;
    int flag = 0;
    for (int i = 5; i <= sqrt(n); i++) {
      if (n % i == 0) {
        if (i >= 5 && n / i >= 5) {
          flag = 1;
          pos = i;
          break;
        }
      }
    }
    if (flag == 0) {
      cout << "-1" << endl;
      continue;
    }
    string s[6];
    s[1] = "aeiou";
    s[2] = "eaoui";
    s[3] = "iuaeo";
    s[4] = "oiuae";
    s[5] = "uoeia";
    for (int i = 1; i <= n / pos; i++) {
      cout << s[(i % 5) ? i % 5 : 5];
      for (int j = 0; j < pos - 5; j++) {
        if (j == 0)
          cout << s[(i % 5) ? i % 5 : 5][1];
        else
          cout << s[(i % 5) ? i % 5 : 5][(j % 4) + 1];
      }
    }
    cout << endl;
  }
}
