import java.util.Scanner;

public class Main {
	public static void main(String args[]){

		Scanner sc = new Scanner(System.in);
		String str;
		int[] listA = new int[26];

		//hasNext()??§?¬?????????????????????¨?????????????????????????????£??????????????£?????????

		while(sc.hasNext()){

			//1???????????????????°??????????????????????
			String SS = sc.nextLine();
			str = SS.toLowerCase();

			//
			for(int i = 0;i < str.length();i++){
				char c = str.charAt(i);

				//???????????£?????????????????\??????
				if(Character.isLetter(c)){
					listA[c - 'a']++;
				}
			}
		}
		//sc.close();

		for(int i = 0; i < listA.length; i++){
			System.out.println((char)( 'a' + i ) + " : " + listA[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