import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {

	public static void main(String[] args) throws IOException{

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] alphabet = new int[26];
		char a = 'a';

		while(true){
			String str = br.readLine();
			if(str == null)
				break;
			for(int i=0; i<str.length(); i++){
				if(Character.isUnicodeIdentifierStart(str.charAt(i))){
					int num = Character.toLowerCase(str.charAt(i)) - 'a';
					alphabet[num]++;
				}
			}
		}

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