import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {

        int[] count = new int['z' - 'a' + 1];

        int c;
        while ((c = System.in.read()) != -1) {
            if (Character.isLetter(c)) {
                if (Character.isUpperCase(c))
                    c = Character.toLowerCase(c);
                count[c - 'a']++;
            }
        }

        for (int i = 0; i < count.length; i++)
            System.out.printf("%c : %d\n", 'a' + i, count[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