import java.io.*;

public class Main
{
	public static void main(String[] args)throws IOException
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();
		StringBuilder sb2 = new StringBuilder();
		String str = "";
		while((str = br.readLine()) != null)		sb.append(str);
		sb2.append(sb.toString().toLowerCase());
		int[] cnt = new int[26];
		int n;
		for(int i=0;i<26;i++) cnt[i]=0;
		for(int i=0; i<sb2.length(); i++)
		{
			n = sb2.charAt(i)-'a';
			if(n>=0&&n<=26)	cnt[n]++;
		}
		char chr = 'a';
		for(int i=0; i<26; i++)	System.out.println(chr++ + " : " + cnt[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