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

public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	}
} import java.io.IOException; IOException java.io import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	}
} Main public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	} main {
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	} final BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String str; str int a[]=new int[26]; a new int[26] 26 while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		} (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 ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		} str=str.toLowerCase() str str.toLowerCase() str.toLowerCase str for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		} int i=0; int i=0; i 0 i<str.length() i str.length() str.length str i++ i++ i {
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		} {
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		} char ch=str.charAt(i); ch str.charAt(i) str.charAt str i if(ch<='z'&&ch>='a') a[ch-97]++; ch<='z'&&ch>='a' ch<='z' ch 'z' ch>='a' ch 'a' a[ch-97]++ a[ch-97] a ch-97 ch 97 for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		} int i=0; int i=0; i 0 i<26 i 26 i++ i++ i {
			System.out.println((char)('a'+i) +" : "+a[i]);
		} {
			System.out.println((char)('a'+i) +" : "+a[i]);
		} System.out.println((char)('a'+i) +" : "+a[i]) System.out.println System.out System System.out (char)('a'+i) +" : "+a[i] (char)('a'+i) +" : "+a[i] (char)('a'+i) 'a' i " : " a[i] a i String[] args args public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	}
} public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	}
} Main
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[i]);
		}
		
		
	}
}