import java.util.Scanner;

public class Main {
	public static final int MAX = 256;

	public static void main(String[] args) {
		int i = 0, k = 0;
		char ch1 = 0;
		Scanner sc = new Scanner(System.in);
		int[] chars = new int[256];
		while (sc.hasNextLine()) {
			String line = sc.nextLine();
			for (i = 0; i < line.length(); i++) {
				char ch = Character.toLowerCase(line.charAt(i));
				chars[ch]++;
			}
		}
		for (char ch = 'a'; ch <= 'z'; ch++)
			System.out.println(ch + " : " + chars[ch]);
	}
}
/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