import java.util.*;
 
class Main {
        public static void main(String args[]) {
                int[] ans = new int[26];
                try (Scanner sc = new Scanner(System.in)) {
                        while (sc.hasNextLine()) {
                                String S = sc.nextLine();
                                S = S.toLowerCase();
                                for (int i = 0; i < S.length(); i++) {
                                        if (0 <= S.charAt(i) - 'a' && S.charAt(i) - 'a' < 26) {
                                                ans[S.charAt(i) - 'a']++;
                                        }
                                }
                        }
                }
                for (int i = 0; i < 26; i++) {
                        System.out.printf("%c : %d\n", i + 'a', ans[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