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 PHP (judge verdict: Accepted)

<?php

$array_data=array();
while(1){

	$x=trim(fgets(STDIN));

	// ????????\??????????????¨?????????
	if($x==""){

		break;
	}

	$array_data[]=$x;
}


// $input=trim(fgets(STDIN));

$array_char=array();

for($i=97;$i<97+26;$i++){

	$array_char[chr($i)]=0;
}


foreach($array_data as $v){

	// ?°???????????????????????????????????????????????????????
	foreach(str_split(strtolower($v)) as $s){

		if(array_key_exists($s,$array_char)){

			$array_char[$s]+=1;

		}

	}

}

#????????¨
foreach($array_char as $key=>$val){

	printf("%s : %d\n",$key,$val);
}