import java.util.Scanner;

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

        do {
            String s = input.nextLine();
            for (char c : s.toCharArray()){
                if ((c < 'A' || 'Z' < c) && (c < 'a' || 'z' < c)) continue;
                alphabet[Character.toLowerCase(c)- 'a']++;
            }
        } while (input.hasNext());

        for (char c = 'a'; c <= 'z'; c++){
            System.out.println(c + " : " + alphabet[c - 'a']);
        }
    }
}
/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