import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????

		
		// ??\???
		Scanner scan = new Scanner(System.in);
		scan.useDelimiter("\\r\\n");
		
		// ??????
		int count[];
		count = new int[26];
		int x = 0;
		while(scan.hasNext()) {
			String S = scan.nextLine();
			if(S.equals ("")) break;
			// ???????????????
			int sl = S.length();
			if(sl == 0000) break;
			// ?°???????????????????
			String s = S.toLowerCase();
			// 1????????\???char??????????´?
			char[] charArray = s.toCharArray();
			for (char ch : charArray) {
				int CH = ch;
				x = CH;
				// a-z?????°??????
				if(((CH-97)>=0) && ((CH-97)<26)){
					count[CH-97]++;
				}
			}
			if(x == 0000) break;
		}
		// ??????
		for (int i=0; i<26; i++) {
			int cords = i + 97;
			char c = (char)cords;
			System.out.println(c + " : " + count[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