import java.io.*;
 
public class Main {
    
    public static void main(String[] args) throws IOException{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        
        int[] counter=new int[26];
        String text;
        
        while((text=br.readLine())!=null){
            for(int i=0;i<text.length();i++){
                char character=Character.toLowerCase(text.charAt(i));
                char alpha='a';
                for(int j=0;j<counter.length;j++){
                    if(character==alpha){
                        counter[j]++;
                    }
                    alpha++;
                }
            }
        }
        
        char alpha='a';
        for(int i=0;i<counter.length;i++){
            System.out.println(alpha+" : "+counter[i]);
            alpha++;
        }
        
    }
}
/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