import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String lines = "";
		
		while(sc.hasNext()){
		    String line = sc.nextLine();
		    
		    lines += line;
		}
		
		lines = lines.toLowerCase().replace(" ","");
		char []array_str = lines.toCharArray();
		
		for (char lit = 'a'; lit <= 'z'; lit++){
		    int count = 0;
		    
		    for (char c: array_str){
		        if (lit == c){
		            count++;
		        }
		    }
		    
		    System.out.println(lit+" : "+count);
		} 
	}
}

/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