//prewritten code: https://github.com/antma/algo
import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.traits;

enum string vowels = "aeiou";

void main() {
  int k = readln.strip.to!int;
  char[] z;
  z.reserve (k);
  for (int h = 5; h * h <= k; ++h) {
    if (k % h == 0) {
      int w = k / h;
      foreach (i; 0 .. h) {
        foreach (j; 0 .. w) {
          z ~= vowels[(i + j) % 5];
        }
      }
      writeln (z);
      return;
    }
  }
  writeln (-1);
}
