import static java.lang.Character.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str;
		int[] count = new int[26];
		while((str = br.readLine()) != null){
			str = str.toLowerCase();
			for(int i = 0;i < str.length();i++){
				char c = str.charAt(i);
				if(isLetter(c)){
					count[c - 'a']++;
				}
			}
		}
		for(int i = 0;i < count.length;i++){
			System.out.print((char)('a' + i));
			System.out.print(" : ");
			System.out.println(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