hash = {}
("a".."z").to_a.each do |c|
  hash[c] = 0
end

ARGF.each_line do |line|
  line.each_char do |c|
    next if c == "\s" || c == "." || c == "\n"
    hash[c.downcase] += 1
  end
end

hash.each do |key, value|
  puts "#{key} : #{value}"
end