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  1. or download this
    /* gcc callfilter.c -o callfilter */
#include <stdio.h>
...

   return 0;
}
  2. or download this
    #!/usr/bin/perl
use strict;
...
local $/;
my $in = <STDIN>;
print {*STDOUT} scalar reverse $in;
  3. or download this
    poletti@PolettiX:~/sviluppo/perl/dup$ ./callfilter
filter says:
olluh