#include <bits/stdc++.h>
using namespace std;
char S[100];
int read() {
  int s = 0;
  int c = getchar(), f = 1;
  while (c < 48 || c > 57) {
    if (c == 45) f = -1;
    c = getchar();
  }
  while (c >= 48 && c <= 57) s = (s << 3) + (s << 1) + (c ^ 48), c = getchar();
  return s * f;
}
void write(int x) {
  if (x >= 10) write(x / 10);
  putchar(x % 10 + 48);
}
void W(int x) {
  if (x < 0) x = -x, putchar(45);
  write(x);
}
int main() {
  int N = read(), M = 0;
  S[0] = 'a';
  S[1] = 'e';
  S[2] = 'i';
  S[3] = 'o';
  S[4] = 'u';
  for (int i = 5; i * i <= N; ++i)
    if (!(N % i)) M = i;
  if (!M)
    puts("-1");
  else {
    N = N / M;
    for (int i = 1; i <= N; ++i)
      for (int j = 1; j <= M; ++j) {
        int u = j - i;
        u %= 5;
        if (u < 0) u += 5;
        putchar(S[u]);
      }
  }
  return 0;
}
