If I create an associative list such as this

var/list/prizes=list("Large Money Bag"=100,"Medium Money Bag"=50, "Small Money Bag"=10)

Then I can randomly select a prize from the list like this.
var/P = pick(prizes)

usr << "Your Prize is a [P]"
P will be equal to the Key "Large Money Bag" how do I set the value of this key 100 to another variable such as A?

Thanks in advance
-Shwn