import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	}
} import java.util.*; util.* java public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	}
} Main static Scanner sc = new Scanner(System.in); sc new Scanner(System.in) public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	} main {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	} int[] AtoZ = new int[26]; AtoZ new int[26] 26 String s = ""; s "" while (sc.hasNext()) {
			s += sc.next();
		} sc.hasNext() sc.hasNext sc {
			s += sc.next();
		} s += sc.next() s sc.next() sc.next sc for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		} int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		} {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		} char c = s.charAt(i); c s.charAt(i) s.charAt s i if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			} c>=65&&c<=90 || c>=97&&c<=122 c>=65&&c<=90 c>=65 c 65 c<=90 c 90 c>=97&&c<=122 c>=97 c 97 c<=122 c 122 {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			} if (c>=65&&c<=90) {c += 32;} c>=65&&c<=90 c>=65 c 65 c<=90 c 90 {c += 32;} c += 32 c 32 int n = (char)(c-97); n (char)(c-97) c 97 AtoZ[n]++ AtoZ[n] AtoZ n for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[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+" "+":"+" "+AtoZ[i]);
		} {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		} char c = (char)(i+97); c (char)(i+97) i 97 System.out.println(c+" "+":"+" "+AtoZ[i]) System.out.println System.out System System.out c+" "+":"+" "+AtoZ[i] " " ":" c+" "+":"+" "+AtoZ[i] c " " ":" " " AtoZ[i] AtoZ i String[] args args public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	}
} public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	}
} Main
import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int[] AtoZ = new int[26];
		String s = "";
		while (sc.hasNext()) {
			s += sc.next();
		}
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			if (c>=65&&c<=90 || c>=97&&c<=122) {
				if (c>=65&&c<=90) {c += 32;}
				int n = (char)(c-97);
				AtoZ[n]++;
			}
		}
		for (int i=0; i<26; i++) {
			char c = (char)(i+97);
			System.out.println(c+" "+":"+" "+AtoZ[i]);
		}
	}
}
