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

class Main{
	
	public static void main(String[] args) throws IOException
	{
		int[] azArray = new int[26];
		char ch = 'a';

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in) );

		while(true)
		{
			String str = br.readLine();

			if(str==null) break;

			char[] cArray = str.toCharArray();

			for(int n : cArray)
			{
				for(int i=0; i<azArray.length; i++)
				{
					if(n==65+i || n==(97+i) ) azArray[i]++;
				}
			}
		}
		
		for(int n : azArray) System.out.printf("%c : %d\n",ch++,n);
	}
}
/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