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

public class Main {
	public static void main(String[] args) throws IOException{
		final BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a[]=new int[26];
		while((str=br.readLine())!=null){
		
		str=str.toLowerCase();
		
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch<='z'&&ch>='a') a[ch-97]++;
		}
		}
		for(int i=0;i<26;i++){
			System.out.println((char)('a'+i) +" : "+a[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