import java.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);
        String s = new String();
        while(in.hasNext()) s=s+in.nextLine();
        s=s.toLowerCase();
		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'};
        for(char c:a){
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	}
} import java.util.Scanner; Scanner java.util class Main {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);
        String s = new String();
        while(in.hasNext()) s=s+in.nextLine();
        s=s.toLowerCase();
		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'};
        for(char c:a){
        	int 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 {
		Scanner in = new Scanner(System.in);
        String s = new String();
        while(in.hasNext()) s=s+in.nextLine();
        s=s.toLowerCase();
		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'};
        for(char c:a){
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	} main {
		Scanner in = new Scanner(System.in);
        String s = new String();
        while(in.hasNext()) s=s+in.nextLine();
        s=s.toLowerCase();
		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'};
        for(char c:a){
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	} Scanner in = new Scanner(System.in); in new Scanner(System.in) String s = new String(); s new String() while(in.hasNext()) s=s+in.nextLine(); in.hasNext() in.hasNext in s=s+in.nextLine() s s+in.nextLine() s in.nextLine() in.nextLine in s=s.toLowerCase() s s.toLowerCase() s.toLowerCase 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' for(char c:a){
        	int 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 {
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        } {
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        } int 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.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(System.in);
        String s = new String();
        while(in.hasNext()) s=s+in.nextLine();
        s=s.toLowerCase();
		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'};
        for(char c:a){
        	int r=0;
        	for(int i=0;i<s.length();i++){
            	if(s.charAt(i)==c)r+=1; 
        	}
        	System.out.println(c+" : "+r);
        }
	}
}