This has caught a lot of people's imagination! Here's my offering. It's a shame the original array is called 'original_array', otherwise it could have been a lot shorter!
my @original_array = qw/ 5 100 2 8 40 /;
my @sequence;
@sequence[
sort {
$original_array[$a] <=> $original_array[$b]
}(0 .. $#original_array)
] = 'A' .. 'Z';
print "@sequence\n";
output
B E A C D
Rob
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