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

public class Main {
	public static int[] charCount = new int[26];

	public static void main(String... args) throws IOException {
		final StringBuilder sb = new StringBuilder();
		final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while (true) {
			final int charactor = br.read();
			if (97 <= charactor && charactor <= 123) {
				charCount[charactor - 97]++;
			} else if (65 <= charactor && charactor <= 91) {
				charCount[charactor - 65]++;
			} else if (charactor == -1) {
				break;
			}
		}

		for (int i = 0; i < 26; i++) {
			sb.append(((char) (i + 97))).append(" : ").append(charCount[i]).append(i != 25 ? '\n' : "");
		}

		System.out.println(sb);
	}
}
/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