import java.util.Scanner;
public class Main {
    public static void main (String[] args) {
	Scanner scan = new Scanner(System.in);
	int[] alpabetDict = new int[26];
	while (scan.hasNext()) {
	    String input = scan.nextLine();
	    char[] inputArray = input.toCharArray();
	    int count = 0;
	    for (int i = 0; i < inputArray.length; i++) {
		if (Character.isLetter(inputArray[i])) {
		    alpabetDict[(int)Character.toLowerCase(inputArray[i]) - 'a']++;
		}
	    }
	}
	for (int i = 0; i < 26; i++) {
	    System.out.println((char)(i+'a') + " : " + alpabetDict[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