import java.util.Scanner;

public class Main{
 public static void main(String[] args){
 Scanner sc = new Scanner(System.in);
 int[] chars = new int[256];
 while(sc.hasNextLine()){
 String line= sc.nextLine();
 for(int i=0;i<line.length();i++){
 char ch =Character.toLowerCase(line.charAt(i));
 for(char search ='a';search<='z';search++){
  if(search == ch){
   chars[search]++;
   }
  }
 }
}
 for(char ch ='a';ch<='z';ch++){
 System.out.println(ch +" : "+ chars[ch]);
  }
 }
}
/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