import java.util.ArrayList;
import java.util.NoSuchElementException;
import java.util.Scanner;
public class CountingCharacters {
private static final int BIG_LETTER = 0;
private static final int LITTLE_LETTER = 1;
private static final int OTHERS = 2;
private static Scanner sc = new Scanner(System.in);
private static int[] counter = new int[26];
private static ArrayList<String> strings = new ArrayList<String>();
public static void main(String[] args) {
try{
while(true){
setInputToStringsList(sc.next());
}
}
catch(NoSuchElementException e){
//EOFが入力されても何もしない
}
finally{
countCharactersAll();
printNumCharacters();
}
}
private static void setInputToStringsList(String input){
strings.add(input);
}
private static void countCharacters(String str){
int num;
for(int i = 0; i < str.length(); i++){
switch(isBigLetter(str.charAt(i))){
case BIG_LETTER:
String character = String.valueOf(str.charAt(i));
character = character.toLowerCase();
num = character.charAt(0) - 'a';
counter[num]++;
break;
case LITTLE_LETTER:
num = str.charAt(i) - 'a';
counter[num]++;
break;
case OTHERS:
//アルファベット以外のときは何もしない
break;
}
}
}
private static void countCharactersAll(){
for(int i = 0; i < strings.size(); i++){
countCharacters(strings.get(i));
}
}
private static void printNumCharacters(){
for(int i = 0; i < 26; i++){
System.out.printf("%c : %d\n", 'a' + i, counter[i]);
}
}
private static int isBigLetter(char c){
if(65 <= c && c <= 90){
return BIG_LETTER;
}
else if(97 <= c && c <= 122){
return LITTLE_LETTER;
}
else{
return OTHERS;
}
}
}