lowest sha512 sum in ruby

lowestsha512sum.rb

require 'digest'

input = ARGV.first || "chris"
lowest_digest = Digest::SHA512.hexdigest(input)
lowest_input = input
begin
       loop do
	        digest = Digest::SHA512.hexdigest(input)
	        if digest < lowest_digest
		       lowest_digest = digest
		       lowest_input = input
	        end
	        input = digest
        end
rescue Exception
	puts lowest_digest
	puts lowest_input
end