import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String line = scanner.nextLine();
Map<Character, Integer> map = new LinkedHashMap<Character, Integer>();
//遍历输入的字符串
for(char c:line.toCharArray()){
//如果是大写或小写字母,则添加到map中,并将出现次数作为键对应的值存到map
if((c>='a'&&c<='z')||(c>='A'&&c<='Z')){
map.put(c,map.getOrDefault(c,0)+1);
}
}
Set<Map.Entry<Character, Integer>> entrys = map.entrySet();
for (Map.Entry<Character, Integer> entry : entrys) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
}