import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		
		int[] count = new int[26];
		while (sc.hasNextLine()) {
			String input = sc.nextLine();

			
			for (char c : input.toCharArray()) {
				c = Character.toLowerCase(c);
				if ('a' <= c && c <= 'z') {
					count[c - 'a']++;
				}
			}
		}

		for (int i = 0; i < 26; i++) {
			System.out.println((char) ('a' + i) + " : " + count[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