import java.util.*;

class Main{
    public static void main(String[] args){
    	Scanner sc= new Scanner(System.in);
    	int a[]=new int[26];String s;
    	
    	for(;;){ 
    		if(sc.hasNextLine()==false) break;
    		s=sc.nextLine();   
    	char CA[] = s.toCharArray(); 
    	
    	for(int i=0;i<s.length();i++){
    		for(int j=0;j<26;j++){
    			if(CA[i]==j+97||CA[i]==j+65){
    			a[j]++;break;
    		}
    	}
    }
    	}
    	
    	for(int j=0;j<26;j++)System.out.println(s=(char)(j+97)+" : "+a[j]);
    }
}
/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