import java.io.*;

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

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