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  1. or download this
    my @digits = split //, abs;
with:
my @digits = split //, $_;
  2. or download this
    C:\_32\pscrpt>perl try.pl
Argument "-" isn't numeric in addition (+) at try.pl line 10.
Argument "-" isn't numeric in addition (+) at try.pl line 10.
Argument "-" isn't numeric in addition (+) at try.pl line 10.
-221 -21 1 1 3 5 21 34 89 144
  3. or download this
    no warnings 'numeric';
  4. or download this
    sub oddDigitSum {
    no warnings 'numeric';
...
    }
    return @ans;
}