import java.io.*;

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];
        char abc ='a';
        
        while((str=br.readLine())!=null){
          
            for(int i=0;i<str.length();i++){
                if(Character.isLetter(str.charAt(i))){
                    count[Character.toLowerCase(str.charAt(i)) - 'a']++;
                }
            }
        }
       for(int i=0;i<26;i++){
           System.out.println(abc++ + " : " +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