import java.io.IOException;
import java.io.InputStreamReader;

class Main {

	public static void main(String args[]) {
		InputStreamReader isr = new InputStreamReader(System.in);
		
		String str;
		
		char c = 'a';

		int id; //read??§?????????????????????????????????????´?
		
		int sum[] = new int[26];
		
		try {
			while((id = isr.read()) != -1) {
				id = Character.toLowerCase(id);
				
				int num = id - 'a'; //id ??? a ???????????????????????????????´?
				
				if(0 <= num && num < 26) {
					sum[num]++;
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		for(int i = 0; i < 26; i++){
			System.out.println(c + " : " +sum[i]);
			c++;
		}
	}
}
/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