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 Python3 (judge verdict: Accepted)

map="abcdefghijklmnopqrstuvwxyz"
count=[0 for i in range(len(map))]

lines=[]

try:
    while True:
        line=input()
        if line=="":
            break
        
        if len(line)==0:
            break
        else:
            lines+=line

except EOFError:
    pass
            
for i in range(len(map)):
    for j in range(len(lines)):
        if map[i]==lines[j].lower():
            count[i]+=1
    print("{} :".format(map[i]),count[i])