Problem:
Counting Characters

Write a program which counts and reports the number of each alphabetical letter. Ignore the case of characters.

Input

A sentence in English is given in several lines.

Output

Prints the number of alphabetical letters in the following format:

a : The number of 'a'
b : The number of 'b'
c : The number of 'c'
.
.
z : The number of 'z'

Constraints

The number of characters in the sentence < 1200

Sample Input

This is a pen.

Sample Output

a : 1
b : 0
c : 0
d : 0
e : 1
f : 0
g : 0
h : 1
i : 2
j : 0
k : 0
l : 0
m : 0
n : 1
o : 0
p : 1
q : 0
r : 0
s : 2
t : 1
u : 0
v : 0
w : 0
x : 0
y : 0
z : 0

Solution in Ruby (judge verdict: Accepted)

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
def aux(txt)
  re=Regexp.new(/[A-Za-z]/)
  h=Hash.new(0)
  txt.split(//).each {|c|
    if re.match(c)
      h[c.downcase] += 1
    end
  }
  h
end

def main
  dat=[]
  fh=STDIN
  #fh=File.new("x.txt", "r")
  txt = fh.read
  hist=aux(txt)

  ('a'..'z').to_a.each{|k|
    puts "#{k} : #{hist[k]}"
  }
end

if $0 == __FILE__ then
  main
end