import java.util.Scanner;

class Main{
       public static void main(String[] args){
    	Scanner scan = new Scanner(System.in);
    	String number;
    	String change;
    	
    	char[] ca;
    	int[] count = new int[26];
    	int num;
    	char alphabet = 'a';
    	
    	while(scan.hasNext()){
    		number = scan.nextLine();
        	change = number.toLowerCase();
        	ca = change.toCharArray();
        	
	    	for(int i = 0; i < ca.length; i++){
	    		num = ca[i] - 'a';
	    		if(num >= 0 && num < 26){
	    			count[num]++;
	    		}
	    	}
     	}
     		
    	
    	for(int i = 0; i < 26; i++){;
    		System.out.println(alphabet + " : " + count[i]);
    		alphabet += 1;
    	}
     }
}
/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