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 C (judge verdict: Time Limit Exceeded)

#include <stdio.h>
int main(void){
    
    char ch;
    int i ;
    int cou[26];
    
    for(i=0;i<26;i++) cou[i]=0;
    
    while(scanf("%c", &ch)){
        if(ch==EOF) break;
            if('A' <= ch && ch<= 'Z')
                cou[ch-'A']++;
            if('a' <= ch && ch <= 'z')
                cou[ch-'a']++;

    }

    for(i=0;i<26;i++)
        printf("%c : %d\n", 'a'+i, cou[i]);
    
    return 0;
}