import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc= new Scanner(System.in);
        
        int[] count=new int['z'];
        for(int i:count){
            i=0;
        }
       while(sc.hasNext()){
           
           String s=sc.next();
           s=s.toLowerCase();
           char[] c=s.toCharArray();
           
           
           for(char a:c){
               
              count[a-1]++;
           }
       }
        
    for(int i='a';i<='z';i++){
        
        System.out.println((char) i+" : "+count[i-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