#include <stdio.h>

main()
{
  unsigned char barr[4], tmp[4] ;

  while ( fread( barr, 4, 1, stdin ) )
    {
      tmp[0] = barr[0] ;
      tmp[1] = barr[1] ;
      tmp[2] = barr[2] ;
      tmp[3] = barr[3] ;

      barr[0] = tmp[3] ;
      barr[1] = tmp[2] ;
      barr[2] = tmp[1] ;
      barr[3] = tmp[0] ;

      fwrite( barr, 4, 1, stdout ) ;
    }
}