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: Accepted)

using System;

namespace Project
{
	class MainClass
	{
		public static void Main(string[] args)
		{

			int[] count = new int[26];
			int a = (int)'a';
			while (true)
			{
				string s = Console.ReadLine();
				if (s == null) break;
				string ss = s.ToLower();
				char[] c = new char[s.Length];
				for (int i = 0; i < s.Length; i++)
				{
					c[i] = (char)ss[i];
				}
				foreach (char ch in c)
				{
					for (int i = 0; i < 26; i++)
					{
						if (ch == (char)(a + i))
							count[i] += 1;
					}
				}
			}
			for (int i = 0; i < 26; i++)
			{
				Console.WriteLine("{0} : {1}", (char)(a + i), count[i]);
			}
		}
	}
}