import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);

		char[] alphabet = "abcdefghijklmnopqrstuvwxyz".toCharArray();
		int[] alphabetNum = new int[26];
		for (int i = 0; i < alphabetNum.length; i++)
		{
			alphabetNum[i] = 0;
		}

		while (sc.hasNext())
		{
			char[] input = sc.next().toLowerCase().toCharArray();

			for (int i = 0; i < input.length; i++)
			{
				for (int j = 0; j < alphabet.length; j++)
				{
					if (input[i] == alphabet[j])
					{
						alphabetNum[j]++;
						break;
					}
				}
			}
		}

		for (int i = 0; i < alphabetNum.length; i++)
		{
			System.out.println(alphabet[i] + " : " + alphabetNum[i]);
		}
	}
}


/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz