import java.util.Scanner;

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

        int[] count;
        count = new int[128];
        String alpha = "abcdefghijklmnopqrstuvwxyz";
        String sen="";
        String pass;

        while(sc.hasNext()){  
            pass = sc.nextLine();        
            sen += pass;
        }
        sen = sen.toLowerCase();
        sen = sen.replace(" ", "");

        for(int i=0; i<sen.length(); i++){
            count[sen.charAt(i)]++;
        }

        for(int i =97; i<=122;i++){
            System.out.println(alpha.charAt(i-97) +" : "+ count[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