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#!/usr/bin/perl -w

...
    $key = sprintf("%s%2.2x", $key, $_);
    print $key, "\n";
}

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$ sudo perl seek.pl 
Argument "à" isn't numeric in sprintf at seek.pl line 20.
...
00000000090000020000040000
Argument "Ä" isn't numeric in sprintf at seek.pl line 20.
0000000009000002000004000000