Ruby script to calculate the frequency of appearance of specific characters in a text, as well as mentioning the letters that were excluded by the author

Letter frequency calculator.rb

puts 'Provide the sentence you want to perform letter frequency on'
text = gets.chomp # gets the sentence to iterate
puts "Performing on: #{text[0..6]}..."
text.downcase!
freqs = {} # creating a hash to iterate 'text'
freqs.default = 0
count = 0 # number of charachters in 'text'

# iterating through text
text.each_char do |char| 
	freqs[char] += 1
	count += 1
end 
unmentioned = []
('a'..'z').each do |x|
  if freqs[x].zero?
    unmentioned << x
    next
  else
    puts "#{x} : #{freqs[x]}"
  end
end
# prints frequency of the characters in 'text'

puts "Your sentence consists of #{count} characters"
puts "Those letters were not mentioned #{unmentioned}"