import java.util.Scanner;

public class Main {
	static int list[] = new int[26];
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	}

	public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	static int list[] = new int[26];
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	}

	public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	}
} Main static int list[] = new int[26]; list new int[26] 26 public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	} main {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		} catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		} IllegalStateException e {
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		} {
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		} while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			} scan.hasNext() scan.hasNext scan {
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			} String str = scan.nextLine(); str scan.nextLine() scan.nextLine scan char ch[] = str.toCharArray(); ch str.toCharArray() str.toCharArray str for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				} int i = 0; int i = 0; i 0 i < ch.length i ch.length ch ch.length i++ i++ i {
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				} {
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				} CountingCharacters(ch[i]) CountingCharacters ch[i] ch i scan.close() scan.close scan for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		} int i = 0; int i = 0; i 0 i < list.length i list.length list list.length i++ i++ i {
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		} {
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		} System.out.println((char)('a' + i) + " : " + list[i]) System.out.println System.out System System.out (char)('a' + i) + " : " + list[i] (char)('a' + i) + " : " + list[i] (char)('a' + i) 'a' i " : " list[i] list i String[] args args public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	} CountingCharacters {
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	} Ch = Character.toLowerCase(Ch) Ch Character.toLowerCase(Ch) Character.toLowerCase Character Ch for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		} int i = 0; int i = 0; i 0 i < list.length i list.length list list.length i++ i++ i {
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		} {
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		} if(Ch == 'a' + i){
				list[i]++;
			} Ch == 'a' + i Ch 'a' + i 'a' i {
				list[i]++;
			} list[i]++ list[i] list i char Ch Ch public class Main {
	static int list[] = new int[26];
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	}

	public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	}
} public class Main {
	static int list[] = new int[26];
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	}

	public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	}
} Main
import java.util.Scanner;

public class Main {
	static int list[] = new int[26];
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		try{
			while(scan.hasNext()){
				String str = scan.nextLine();
				char ch[] = str.toCharArray();
				for(int i = 0; i < ch.length; i++){
					/*if(ch[i] == '.'){
						scan.close();
					}*/
					CountingCharacters(ch[i]);
				}
			}
		}catch(IllegalStateException e){
			/*char alp = 97;
			for(int i = 0; i < list.length; i++){
				alp = Character.valueOf((char) (97 + i));
				System.out.println(alp + " : " + list[i]);
			}*/
		}
		scan.close();
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//alp = Character.valueOf((char) (97 + i));
			System.out.println((char)('a' + i) + " : " + list[i]);
		}
	}

	public static void CountingCharacters(char Ch){
		Ch = Character.toLowerCase(Ch);
		//char alp = 97;
		for(int i = 0; i < list.length; i++){
			//a to z = 97 to 122
			if(Ch == 'a' + i){
				list[i]++;
			}
		}
	}
}