import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	}

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

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	} main {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String sep = System.getProperty("line.separator"); sep System.getProperty("line.separator") System.getProperty System "line.separator" sc.useDelimiter(sep+sep) sc.useDelimiter sc sep+sep sep sep String s = sc.next(); s sc.next() sc.next sc char characters[] = s.toCharArray(); characters s.toCharArray() s.toCharArray s int count[] = new int[26]; count new int[26] 26 for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		} int i = 0; int i = 0; i 0 i < characters.length i characters.length characters characters.length i++ i++ i {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		} {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		} for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			} int j = 0; int j = 0; j 0 j < 26 j 26 j++ j++ j {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			} {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			} if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				} characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65) characters[i] == (char) (j + 97) characters[i] characters i (char) (j + 97) j 97 characters[i] == (char) (j + 65) characters[i] characters i (char) (j + 65) j 65 {
					count[j]++;
				} count[j]++ count[j] count j for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		} int i = 0; int i = 0; i 0 i < 26 i 26 i++ i++ i {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		} {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		} char c = (char) (i + 97); c (char) (i + 97) i 97 System.out.println(c + " : " + count[i]) System.out.println System.out System System.out c + " : " + count[i] c + " : " + count[i] c " : " count[i] count i String[] args args public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String sep = System.getProperty("line.separator");
		sc.useDelimiter(sep+sep);
		String s = sc.next();
		char characters[] = s.toCharArray();
		int count[] = new int[26];
		for (int i = 0; i < characters.length; i++) {
			for (int j = 0; j < 26; j++) {
				if (characters[i] == (char) (j + 97) || characters[i] == (char) (j + 65)) {
					count[j]++;
				}
			}

		}

		for (int i = 0; i < 26; i++) {
			char c = (char) (i + 97);

			System.out.println(c + " : " + count[i]);
		}

	}

}