So far everyone has sorted your numbers, which isn't what you asked for. Try this: 

    my @nums= <STDIN>;
    my @index= sort { $nums[$a-1] <=> $nums[$b-1] } 1..@nums;
    print join "\n", @index, '';

[download]
it prints: 
1
2
4
3
5

[download]
just like you wanted.

                - tye

In reply to Re: Sorting numbers (not) by tye
in thread Sorting numbers by Anonymous Monk

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