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.hasNextLine()){
            sb.append(sc.nextLine().toLowerCase());
        }

        char now;
        char a = 'a';
        int[] data = new int[26];
        String line = sb.toString();

        for(int i = 0; i < line.length(); i++){
            now = line.charAt(i);
            for(int j = 0; j < 26; j++){
                if(now == (char)(a+j)){
                    data[j]++;
                    break;
                }
            }
        }

        for(int i = 0; i < 26; i++){
            System.out.println((char)(a+i) + " : " + data[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