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;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _1_8_C
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] _largeInitial = { "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[] _smallInitial = { "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"};
            int[] _count = new int[26];
            List<string> _readText = new List<string>();
            while(true)
            {
                string _readLine = Console.ReadLine();
                if (_readLine == null) break;
                _readText.Add(_readLine);
                
            }
            for (int j = 0; j < _readText.Count; j++)
            {
                char[] chars = _readText[j].ToCharArray();
                //_readText[j]を一文字ずつ_readInitialに収納
                List<string> _readInitial = new List<string>();
                for (int i = 0; i < _readText[j].Length; i++) _readInitial.Add(_readText[j].Substring(i,1));
                for (int g = 0; g < _readText[j].Length; g++)
                {
                    for (int i = 0; i < 26; i++)
                    {
                        if (_readInitial[g] == _largeInitial[i] | _readInitial[g] == _smallInitial[i])
                        {
                            _count[i]++;
                        }
                    }
                }
            }
            for(int i = 0; i < 26; i ++)
            Console.WriteLine("{0} : {1}", _smallInitial[i], _count[i]);
        }
    }
}