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  1. or download this
    #! /usr/bin/perl
    use warnings;
    ...
    open $IN, '<', '1' or die $!;
    my $bytes = <$IN>;
    say length $bytes;      # 2
    
  2. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
    }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,