What do you think?

I think you should use the code I showed :)

my ($x, $y, $z) = split /\s+/, $line;
[download]

• \s+ grabs a variable number of spaces: 1, 5, whatever. This is documented in the link I showed you: split.
• $a and $b have special meaning to sort. Don't use them here. You should probably use more meaningful names as well.

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