import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] sum = new int[26];

		while(sc.hasNext()) {
			String line = sc.next();

			char[] chars =  line.toCharArray();
			for(int i = 0;i < chars.length; i++) {
				for(int j = 0;j < 26; j++) {
					if(chars[i] == 'a' + j || chars[i] == 'A' + j) {
						sum[j]++;
					}
				}
			}

		}

		for(int i = 0;i < sum.length;i++) {
			int ab = 'a' + i;

			System.out.println((char)ab + " : " + sum[i]);
		}
		sc.close();

	}
}
/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