#include <stdio.h>
#include <stdlib.h>

int main()
{
  int *even_elements( int *, int );

  for ( ; ; )
  {
    int elements, i, *t, *p;

    scanf( "%d", &elements );
    if ( elements == 0 )
      break;

    t = ( int * )malloc( elements * sizeof( int ) );

    for ( i = 0; i < elements; ++i )
      scanf( "%d", &t[ i ] );

    p = even_elements( t, elements );

    for ( i = 0; i <= p[ 0 ]; ++i )
    {
      if ( i > 0 )
        putchar( ' ' );
      printf( "%d", p[ i ] );
    }
    putchar( '\n' );

    free( p );
    free( t );
  }
  return EXIT_SUCCESS;
}