import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        new Main().solve();
    }

    Scanner sc = new Scanner(System.in);

    void solve() {
        Map<String, Integer> map = new HashMap<String, Integer>();
        for (char c = 'a'; c <= 'z'; c++) {
            map.put(String.valueOf(c), 0);
        }
        String str;
        while (sc.hasNext()) {
            str = sc.nextLine();
            char[] strArr = str.toCharArray();
            for (int i = 0; i < strArr.length; ++i) {
                if (map.containsKey(String.valueOf(Character.toLowerCase(strArr[i]))))
                    map.put(String.valueOf(Character.toLowerCase(strArr[i])),
                            map.get(String.valueOf(Character.toLowerCase(strArr[i]))) + 1);
            }
        }
        for (char c = 'a'; c <= 'z'; c++) {
            System.out.println(c + " : " +
                    map.get(String.valueOf(Character.toLowerCase(c))));
        }
    }
}





/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