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


public class Main{

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main{

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	}

} Main public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	} main {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	} String line; line BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int[] cnt = new int[26]; cnt new int[26] 26 while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		} (line = br.readLine()) != null (line = br.readLine()) line br.readLine() br.readLine br null {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		} line = line.toLowerCase() line line.toLowerCase() line.toLowerCase line for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			} char c line.toCharArray() line.toCharArray line {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			} {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			} if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				} 'a' <= c && c <= 'z' 'a' <= c 'a' c c <= 'z' c 'z' {
					cnt[c - 'a']++;
				} cnt[c - 'a']++ cnt[c - 'a'] cnt c - 'a' c 'a' for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		} int i = 0; int i = 0; i 0 i < 26 i 26 i++ i++ i {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		} {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		} System.out.println((char)('a' + i) + " : " + cnt[i]) System.out.println System.out System System.out (char)('a' + i) + " : " + cnt[i] (char)('a' + i) + " : " + cnt[i] (char)('a' + i) 'a' i " : " cnt[i] cnt i String[] args args public class Main{

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	}

} public class Main{

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	}

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


public class Main{

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String line;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int[] cnt = new int[26];
		
		while ((line = br.readLine()) != null) {
			line = line.toLowerCase();
			for (char c : line.toCharArray()) {
				if ('a' <= c && c <= 'z') {
					cnt[c - 'a']++;
				}
			}
		}
		
		for (int i = 0; i < 26; i++) {
			System.out.println((char)('a' + i) + " : " + cnt[i]);
		}
	}

}