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

public class Main {
	public static void main (String[] args) throws IOException
	{
		BufferedReader input = new BufferedReader (new InputStreamReader (System.in));

		int[] alphabet = new int[26];

		char moji;

		char MOJI;

		//配列の初期化
		for(int num = 0; num < alphabet.length; num++)
		{
			alphabet[num] = 0;
		}

		//何行読み取るか
		while(true)
		{
			String str = input.readLine();

			if(str == null || str.length() == 0)
				break;

			//文字列のアルファベットの数を数える
			for(int num = 0; num < str.length(); num++)
			{
				moji = 'a';

				MOJI = 'A';

				for(int kazu = 0; kazu < alphabet.length; kazu++, moji++, MOJI++)
				{
					if(str.charAt(num) ==  moji || str.charAt(num) ==  MOJI)
					{
						alphabet[kazu]++;

					break;
					}
				}
			}
		}

		moji = 'a';

		//結果を表示する
		for(int num = 0; num < alphabet.length; num++, moji++)
		{
			System.out.println(moji + " : " + alphabet[num]);
		}

	}
}


/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