import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	}
}
 import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	}
} Main public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc while (sc.hasNext()) {
			line += sc.nextLine();
		} sc.hasNext() sc.hasNext sc {
			line += sc.nextLine();
		} line += sc.nextLine() line sc.nextLine() sc.nextLine sc int len = 'z'-'a'+1; len 'z'-'a'+1 'z'-'a' 'z' 'a' 1 int cnt[] = new int[len]; cnt new int[len] len for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		} int i = 0; int i = 0; i 0 i < line.length() i line.length() line.length line i++ i++ i {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		} {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		} char c = line.charAt(i); c line.charAt(i) line.charAt line i if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			} c >= 'a' && c <= 'z' c >= 'a' c 'a' c <= 'z' c 'z' {
				cnt[c-'a']++;
			} cnt[c-'a']++ cnt[c-'a'] cnt c-'a' c 'a' if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			} c >= 'A' && c <= 'Z' c >= 'A' c 'A' c <= 'Z' c 'Z' {
				cnt[c-'A']++;
			} cnt[c-'A']++ cnt[c-'A'] cnt c-'A' c 'A' for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		} int i = 0; int i = 0; i 0 i < len i len i++ i++ i {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		} {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		} char c = (char)('a' + i); c (char)('a' + i) 'a' i System.out.println(c + " : " + cnt[i]) System.out.println System.out System System.out c + " : " + cnt[i] c + " : " + cnt[i] c " : " cnt[i] cnt i String[] args args public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.nextLine();
		while (sc.hasNext()) {
			line += sc.nextLine();
		}
		int len = 'z'-'a'+1;
		int cnt[] = new int[len];
		for (int i = 0; i < line.length(); i++) {
			char c = line.charAt(i);
			if (c >= 'a' && c <= 'z') {
				cnt[c-'a']++;
			}
			if (c >= 'A' && c <= 'Z') {
				cnt[c-'A']++;
			}
		}
		for (int i = 0; i < len; i++) {
			char c = (char)('a' + i);
			System.out.println(c + " : " + cnt[i]);
		}
	}
}

