Write a subroutine, 'subst', which gets a string argument, $s.  It
should search $s and replace any occurrences of "$1" with the current
value of $1, any occurrences of "$2" with the current value of $2, and
so on.

For example, if $1, $2, and $3 happen to be "dogs", "fish" and
"carrots", then

        subst("$2, $1 and $3")

should return

        "fish, dogs, and carrots"

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Some notes:

 * I'll post an example solution here on Monday.

 * perl-qotw will only carry the quizzes and solutions.  Discussion,
   remarks, comments, and soforth should go to
   perl-qotw-discuss@plover.com.  To subscribe to that list, send mail
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 * I'd like to request that nobody post any sample solutions or other
   spoilers to the discussion list until at least Saturday.

 * Even after Saturday, any solutions or other spoilers should always
   be marked with the word SPOILER in the subject line, so that other
   people won't see them by accident.

 * If you'd like to contribute a quiz question, send it to me.

 * I will set up a web archive eventually.  In the meantime, old
   messages are always available by email.  Send a message to
   perl-qotd-help@plover.com (or to
   perl-qotd-discussion-help@plover.com) for instructions.

Thanks.