import java.util.*;
public class Main {
    public static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
    	int i, j, k;
    	String moji = "";
    	int count[] = new int[26];
	    while(sc.hasNextLine()) {
	    	moji += sc.nextLine();
	    }
	    moji = moji.toLowerCase();
	   	for(i = 0; i < moji.length(); i++) {
	   		char c = moji.charAt(i);
	   		if('a' <= c && 'z' >= c) {
	   			count[c - 'a']++;
	   		}
	   	}
    	for(i = 0; i < 26; i++) {
    		System.out.println((char)(i + 'a') + " : " + count[i]);
    	}
    }
}

/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