import java.io.*;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

		String sentence;
		int[] abc = new int[26];

		while ((sentence = input.readLine()) != null) {
			for (int i = 0; i < sentence.length(); i++) {
				char c = sentence.charAt(i);
				     c = Character.toLowerCase(c);
				char cc = 'a';
				for (int j = 0; j < abc.length; j++) {
					if (cc == c)
						abc[j]++;
					cc++;
				}
			}
		}

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

}
/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