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/ruby
# -*- coding: utf-8 -*-
=begin
ITP1_8-C
 
Character - Counting Characters
Time Limit : 1 sec, Memory Limit : 65536 KB
?????????????????????

?????????????????±??????????????????????????¢???????????????????????°?????°??????????????°????????????????????????????????? ??????????°?????????¨??§??????????????\???????????????
Input

?????°????????????????????????????????±???????????????????????????
Output

?????????????????±???????????????????????¢???????????????????????°?????\??????????????¢?????§????????????????????????

a : a????????°
b : b????????°
c : c????????°
  .
  .
z : z????????°

Constraints

    ??±???????????????????????° < 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

=end
fh=STDIN
#fh=open("IPT1_8_C.txt")
h = Hash.new
("a".."z").each {|c| h[c]=0}
while fh.gets
  s=$_.chomp
  str=s.downcase.split(//)
  str.each {|c|
    if not h.has_key?(c) then
      h[c]=0
    end
    h[c] += 1
  }
end

("a".."z").each {|c| puts c + " : " + h[c].to_s}