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

public class Main {
	public static BufferedReader br;
	public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[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 BufferedReader br;
	public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	}
} Main public static BufferedReader br; br public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	} main {
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	} br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) int c[]=new int[26]; c new int[26] 26 String str; str while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		} (str = br.readLine())!=null (str = br.readLine()) str br.readLine() br.readLine br null {
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		} str = str.toLowerCase() str str.toLowerCase() str.toLowerCase str for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			} int i=0; int i=0; i 0 i<str.length() i str.length() str.length str i++ i++ i {
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			} {
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			} char a='a'; a 'a' for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				} int j=0; int j=0; j 0 j<26 j 26 j++ j++ j {
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				} {
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				} if(!Character.isLetter(str.charAt(i)))break; !Character.isLetter(str.charAt(i)) Character.isLetter(str.charAt(i)) Character.isLetter Character str.charAt(i) str.charAt str i break; if(a==str.charAt(i)){
						c[j]++;
					} a==str.charAt(i) a str.charAt(i) str.charAt str i {
						c[j]++;
					} c[j]++ c[j] c j a++ a for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		} int i=0; int i=0; i 0 i<26 i 26 i++ i++ i {
			System.out.println((char)('a'+i)+" : "+c[i]);
		} {
			System.out.println((char)('a'+i)+" : "+c[i]);
		} System.out.println((char)('a'+i)+" : "+c[i]) System.out.println System.out System System.out (char)('a'+i)+" : "+c[i] (char)('a'+i)+" : "+c[i] (char)('a'+i) 'a' i " : " c[i] c i String[] args args public class Main {
	public static BufferedReader br;
	public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	}
} public class Main {
	public static BufferedReader br;
	public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static BufferedReader br;
	public static void main(String[] args)throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		int c[]=new int[26];
		String str;
		while((str = br.readLine())!=null){
			str = str.toLowerCase();
			for(int i=0;i<str.length();i++){
				char a='a';
				for(int j=0;j<26;j++){
					if(!Character.isLetter(str.charAt(i)))break;
					if(a==str.charAt(i)){
						c[j]++;
					}
					a++;
				}
			}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i)+" : "+c[i]);
		}
	}
}