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: Wrong Answer)

using System;
using System.Collections.Generic;

namespace ITP1_8_C {
    class Program {
        static void Main(string[] args) {
            string s = Console.ReadLine();
            char[] c = s.ToCharArray();
            string[] alfa = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
            string[] s1 = new string[s.Length];
            for(int i = 0; i < s.Length; i++) {
                s1[i] = c[i].ToString();
            }
            var str = new List<string>();
            str.AddRange(s1);
            var strTable = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
            for(int i = 0; i < alfa.Length; i++) {
                strTable.Add(alfa[i], 0);
            }           
            foreach(string key in str) {
                if(strTable.ContainsKey(key)) {
                    strTable[key]++;
                }
            }
            foreach(KeyValuePair<string, int> kvp in strTable) {
                Console.WriteLine("{0} : {1}", kvp.Key, kvp.Value);
            }
        }
    }
}