gistfile1.txt

puts "Type a sentence."
text = gets.chomp

words = text.split

frequencies = Hash.new(0)

words.each do |x|
    frequencies[x] += 1
end

#
frequencies = frequencies.sort_by do |word|
    word.count
end

OR 

frequencies = frequencies.sort_by do |word, count|
    count
end
#

frequencies.reverse!

puts frequencies