public static void main ( String [ ] args ) throws IOException {
  StringBuffer ans = new StringBuffer ( ) ;
  StringTokenizer st ;
  BufferedReader f = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  st = new StringTokenizer ( f . readLine ( ) ) ;
  int k = Integer . parseInt ( st . nextToken ( ) ) ;
  f . close ( ) ;
  int n = 0 ;
  int m = 0 ;
  for ( int i = 5 ;
  i < k ;
  i ++ ) {
    if ( k % i == 0 ) {
      if ( k / i >= 5 ) {
        n = i ;
        m = k / i ;
      }
      else break ;
    }
  }
  if ( n == 0 ) {
    System . out . println ( - 1 ) ;
    return ;
  }
  char [ ] a = {
    'a' , 'e' , 'i' , 'o' , 'u' };
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      for ( int x = 0 ;
      x < m ;
      x ++ ) {
        ans . append ( a [ ( i + x ) % 5 ] ) ;
      }
    }
    System . out . println ( ans ) ;
  }
  
public static void main ( String [ ] args ) throws IOException { StringBuffer ans = new StringBuffer ( ) ; StringTokenizer st ; BufferedReader f = new BufferedReader ( new InputStreamReader ( System . in ) ) ; st = new StringTokenizer ( f . readLine ( ) ) ; int k = Integer . parseInt ( st . nextToken ( ) ) ; f . close ( ) ; int n = 0 ; int m = 0 ; for ( int i = 5 ; i < k ; i ++ ) { if ( k % i == 0 ) { if ( k / i >= 5 ) { n = i ; m = k / i ; } else break ; } } if ( n == 0 ) { System . out . println ( - 1 ) ; return ; } char [ ] a = { ' a ' , ' e ' , ' i ' , ' o ' , ' u ' } ; for ( int i = 0 ; i < n ; i ++ ) { for ( int x = 0 ; x < m ; x ++ ) { ans . append ( a [ ( i + x ) % 5 ] ) ; } } System . out . println ( ans ) ; }
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