import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] counter = new int[27];
        int flag=0;
        while (sc.hasNext()) {
            String in = sc.nextLine();
           
            in=in.toLowerCase();
            for (int i = 0; i < in.length(); i++) {
          
                int value = in.charAt(i)-'a' ;
                if(value<0 || value>26){
                    continue;
                }
                if(value==-51){
                    flag=1;
                    break;
                }
           
               
                counter[value]++;
            }
            
            if(flag==1){
                break;
            }
        }
        for (int i = 0; i < 26; i++) {
            System.out.printf("%c : %d\n", i + 'a', counter[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