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

        // ??????????????????????????????.
        java.util.Scanner sc = new java.util.Scanner(System.in);

        // ??¢??????????????????????????°????¨??????????????????????????????????????????????.
        int[] num = new int[26];
        for (int i = 0; i < 26; i ++) { num[i] = 0; }

        // ???????????????????????§????????????????????? 1 ?????\???????????????????????????.
        // ???????????? 1 ???????????????????????¢??????????????????????????°?????????????????????.
        while (sc.hasNext()) {
            String s = sc.nextLine();
            for (int i = 0; i < s.length(); i ++) {
                if (s.charAt(i) <= 'Z' && 'A' <= s.charAt(i)) { num[s.charAt(i) - 'A'] ++; }
                else if (s.charAt(i) <= 'z' && 'a' <= s.charAt(i)) { num[s.charAt(i) - 'a'] ++; }
            }
        }
        char c = 'a';
        for (int i = 0; i < 26; i ++) {
            System.out.println(c + " : " + num[i]);
            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