#include <bits/stdc++.h>
using namespace std;
int main() {
  long l;
  cin >> l;
  int div = 0;
  for (int i = 5; i < 1 + pow(l, 0.5); i++) {
    if (l % i == 0) {
      div = i;
      break;
    }
  }
  if (div == 0 || (l / div) < 5) {
    cout << -1 << endl;
  } else {
    char a[div][int(l / div)];
    a[0][0] = 'a';
    a[0][1] = 'e';
    a[0][2] = 'i';
    a[0][3] = 'o';
    a[0][4] = 'u';
    a[1][0] = 'e';
    a[1][1] = 'i';
    a[1][2] = 'o';
    a[1][3] = 'u';
    a[1][4] = 'a';
    a[2][0] = 'i';
    a[2][1] = 'o';
    a[2][2] = 'u';
    a[2][3] = 'a';
    a[2][4] = 'e';
    a[3][0] = 'o';
    a[3][1] = 'u';
    a[3][2] = 'a';
    a[3][3] = 'e';
    a[3][4] = 'i';
    a[4][0] = 'u';
    a[4][1] = 'a';
    a[4][2] = 'e';
    a[4][3] = 'i';
    a[4][4] = 'o';
    for (int i = 0; i < 5; i++) {
      for (int j = 5; j < (l / div); j++) {
        a[i][j] = a[i][j - 5];
      }
    }
    for (int i = 5; i < div; i++) {
      for (int j = 0; j < (l / div); j++) {
        a[i][j] = a[i - 5][j];
      }
    }
    for (int i = 0; i < div; i++) {
      for (int j = 0; j < (l / div); j++) {
        cout << a[i][j];
      }
    }
    cout << endl;
  }
}
