import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder sb = new StringBuilder();
        while (sc.hasNext()) {
            sb.append(sc.nextLine().toLowerCase());
        }
        String s = sb.toString();
        int[] count = new int[26];
        for (int i = 0; i < s.length(); i++) {
            int point = s.codePointAt(i);
            if (97 <= point && point <= 122) {
                count[point - 97]++;
            }
        }
        for (int i = 0; i < count.length; i++) {
            System.out.println(Character.toChars(i + 97)[0] + " : " + 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