
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		// ????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		// ??£?¨?
		String line = "";
		char temp;
		// 26???????????¨?????????
		int[] array = new int[26];
		while (sc.hasNext()) {
			// ??±????????????
			line = sc.nextLine();
			// ??¨???????????????????°??????????????????????
			String lower = line.toLowerCase();
			// System.out.println(lower);
			// ?????????char ??????
			for (int i = 0; i < lower.length(); i++) {
				temp = lower.charAt(i);
				// System.out.println(temp);
				// ??\?????????????????¨a?????¢???????????????????????°?????§??????
				// if(Character.isLetter('a')){
				if ('a' <= temp && temp <= 'z') {
					array[temp - 'a']++;
				}
			}
		}
		for (int i = 0; i < array.length; i++) {
			System.out.println((char) ('a' + i) + " : " + array[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