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  1. or download this
    ++$|;
    undef $/;
    ...
        s/\Q${\substr($a, 0, 1);}\E/${\substr($a, 1);}\n;/g;
    }
    eval $_;
    
  2. or download this
    [
    <
    -
    ]
    
  3. or download this
    while($p[$p]){
    ;$p--
    ;$p[$p]--
    ;}
    ;