import java.util.Scanner;

public class Main {

	public static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	}

	public static String input() {

		return scanner.nextLine();

	}

	public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	}

	public static String input() {

		return scanner.nextLine();

	}

	public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	}
} Main public static Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	} main {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	} int[] abc = new int[26]; abc new int[26] 26 String input = ""; input "" while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		} scanner.hasNext() scanner.hasNext scanner {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		} input = input().toLowerCase() input input().toLowerCase() input().toLowerCase input() input for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			} int i = 0; int i = 0; i 0 i < input.length() i input.length() input.length input i++ i++ i {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			} {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			} char charNumber = input.charAt(i); charNumber input.charAt(i) input.charAt input i if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				} 'a' <= charNumber && charNumber <= 'z' 'a' <= charNumber 'a' charNumber charNumber <= 'z' charNumber 'z' {

					abc[charNumber - 'a']++;

				} abc[charNumber - 'a']++ abc[charNumber - 'a'] abc charNumber - 'a' charNumber 'a' for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		} int j = 0; int j = 0; j 0 j < 26 j 26 j++ j++ j {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		} {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		} System.out.println((char)('a' + j) + " : " + abc[j]) System.out.println System.out System System.out (char)('a' + j) + " : " + abc[j] (char)('a' + j) + " : " + abc[j] (char)('a' + j) 'a' j " : " abc[j] abc j close() close String[] args args public static String input() {

		return scanner.nextLine();

	} input {

		return scanner.nextLine();

	} return scanner.nextLine(); scanner.nextLine() scanner.nextLine scanner public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	} close {

		if (scanner != null) {

			scanner.close();

		}
	} if (scanner != null) {

			scanner.close();

		} scanner != null scanner null {

			scanner.close();

		} scanner.close() scanner.close scanner public class Main {

	public static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	}

	public static String input() {

		return scanner.nextLine();

	}

	public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	}
} public class Main {

	public static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	}

	public static String input() {

		return scanner.nextLine();

	}

	public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	}
} Main
import java.util.Scanner;

public class Main {

	public static Scanner scanner = new Scanner(System.in);

	public static void main(String[] args) {

		int[] abc = new int[26];
		String input = "";

		while (scanner.hasNext()) {

			input = input().toLowerCase();

			for (int i = 0; i < input.length(); i++) {

				char charNumber = input.charAt(i);

				if ('a' <= charNumber && charNumber <= 'z') {

					abc[charNumber - 'a']++;

				}
			}
		}

			for (int j = 0; j < 26; j++) {

			System.out.println((char)('a' + j) + " : " + abc[j]);

		}

		close();

	}

	public static String input() {

		return scanner.nextLine();

	}

	public static void close() {

		if (scanner != null) {

			scanner.close();

		}
	}
}