import java.util.HashMap;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        try {
            HashMap<Character, Integer> m = new HashMap<>();
            for (char c = 'a'; c <= 'z'; c++) {
                m.put(c, 0);
            }
            while (sc.hasNext()) {
                String s = sc.nextLine().toLowerCase();
                for (int i = 0; i < s.length(); i++) {
                    if (Character.isAlphabetic(s.codePointAt(i))) {
                        Integer c = m.get(s.charAt(i));
                        m.put(s.charAt(i), ++c);
                    }
                }
            }
            for (char c = 'a'; c <= 'z'; c++) {
                System.out.println(c + " : " + m.get(c));
            }
        } catch (NoSuchElementException
                | NumberFormatException e) {
            System.out.println(e);
        }
    }
}


/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