sentence = gets.chomp

alphabets = {"a" => 0, "b" => 0, "c" => 0, "d" => 0, "e" => 0, "f" => 0,
             "g" => 0, "h" => 0, "i" => 0, "j" => 0, "k" => 0, "l" => 0,
             "m" => 0, "n" => 0, "o" => 0, "p" => 0, "q" => 0, "r" => 0,
             "s" => 0, "t" => 0, "u" => 0, "v" => 0, "w" => 0, "x" => 0,
             "y" => 0, "z" => 0}

sentence.each_char do |char|
   if /[a-zA-Z]/ =~ char
      alphabets["#{char.downcase}"] += 1
   end
end

alphabets.each do |key, val|
   puts "#{key} : #{val}"
end