h = Hash.new()
str = String.new

("a".."z").each{|c| h[c] = 0}

while temp = gets
    str += temp.chomp.downcase
end

str.gsub!(/[^a-zA-Z]/, "")
str.each_char{|c| h[c] += 1 }
h.each{|k,v| puts "#{k} : #{v}" }
