import java.io.*;
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		BufferedReader br = 
				new BufferedReader(new InputStreamReader(System.in));
		Scanner scan = new Scanner(System.in);
		String str = "";
		String check="";
		int[] alph = new int[26];
		while(scan.hasNext()){
			str = scan.next();
			for(int j=0;j<str.length();j++){
				check =String.valueOf(str.charAt(j));	
				if(check.matches("[a-z]+")){
					alph[str.charAt(j)-'a']++;
				}else if(check.matches("[A-Z]+")){
					alph[str.charAt(j)-'A']++;
				}
			}
			//System.out.println(str.length());
			//System.out.println(Character.isLetterOrDigit(str.charAt(0)));
		}
		for(int i=97;i<123;i++)
			System.out.println((char)i+" : "+alph[i-97]);
	}
}
/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