Nope, you can't use pop, unless you use it like this: "@{[pop]}" .. The quotes turn it into a string instead of an integer, so the | does a bitstring or instead of a numeric or. If either of the operands are numeric, you'll get the numeric or: 
perl -we 'print "000"|1'
1

[download]
that doesn't work for us, we need this: 
perl -we 'print "000"|"1"'
100

[download]
--sean

and yeah, i came up with a handful of slightly different attempts that all came in at 55 too.

In reply to Nope.. by sean
in thread (Golf) Kaprekar's Process by srawls

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