import java.io.*;

class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String l,s="";
		while ((l=br.readLine())!=null) s+=l.toLowerCase();
		s=s.replace(" ","");
		char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int r;
        for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	}
} import java.io.*; io.* java class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String l,s="";
		while ((l=br.readLine())!=null) s+=l.toLowerCase();
		s=s.replace(" ","");
		char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int r;
        for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	}
} Main public static void main(String[] args) throws Exception {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String l,s="";
		while ((l=br.readLine())!=null) s+=l.toLowerCase();
		s=s.replace(" ","");
		char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int r;
        for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	} main {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String l,s="";
		while ((l=br.readLine())!=null) s+=l.toLowerCase();
		s=s.replace(" ","");
		char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int r;
        for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	} BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String l l s=""; s "" while ((l=br.readLine())!=null) s+=l.toLowerCase(); (l=br.readLine())!=null (l=br.readLine()) l br.readLine() br.readLine br null s+=l.toLowerCase() s l.toLowerCase() l.toLowerCase l s=s.replace(" ","") s s.replace(" ","") s.replace s " " "" char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; a {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'} 'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o' 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' 'x' 'y' 'z' int r; r for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        } char c a {
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        } {
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        } r=0 r 0 for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	} int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
            	if(s.charAt(i)==c) r+=1; 
        	} {
            	if(s.charAt(i)==c) r+=1; 
        	} if(s.charAt(i)==c) r+=1; s.charAt(i)==c s.charAt(i) s.charAt s i c r+=1 r 1 System.out.println(c+" : "+r) System.out.println System.out System System.out c+" : "+r c+" : "+r c " : " r String[] args args
import java.io.*;

class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String l,s="";
		while ((l=br.readLine())!=null) s+=l.toLowerCase();
		s=s.replace(" ","");
		char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int r;
        for(char c:a){
        	r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c) r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	}
}