import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

class Main{
    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static final PrintWriter out = new PrintWriter(System.out);
    public static void main(String[] Args) throws IOException{
        final int[] alph = new int[26];
        String in;
        while( (in = br.readLine())!=null){
            for(int i = 0; i<in.length(); i++){
                if(Character.isUpperCase(in.charAt(i))) alph[in.charAt(i)-'A']++;
                if(Character.isLowerCase(in.charAt(i))) alph[in.charAt(i)-'a']++;
            }
        }
        for(int i = 0; i<26; i++){
            out.print((char) ('a'+i));
            out.print(" : ");
            out.println(alph[i]);
        }
        out.flush();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz