import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		boolean f = true;
		int[] c = new int['z' - 'a' + 1];
		while (s.hasNext()) {
			char[] chars = s.next().toLowerCase().toCharArray();
			for (char ch : chars) {
				if (Character.isLetter(ch)) {
					c[ch - 'a']++;
				}
			}
		}
		for (int i = 0; i < c.length; ++i) {
			System.out.printf("%c : %d\n", (char)('a' + i), c[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