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

// (1) ??¢??????????????????????????°???????´??????????????????°count???????????????
// (2) ??????????????????????????????
// (3) ??????????????????????????????????????°?????????1??????????????\?????????????????????
	// (4.1) ????±???¨??????1?????????Char??????????????????
		// (4.1.1)??¢???????????????????????°???????????\?????????????????????
			// (4.1.1.1) ??????????????????????´?????????¢????????????????????¨
            //		     ????±???¨??????1?????????ASCII?????????????????´????????´????????\?????????????????????
				// (4.1.1.1.1) ?????°count?????°???????¢???????
			// (4.1.1.2) ?????????????±???¨??????1???????????§???????????´????????\?????????????????????
				// (4.1.1.2.1) ?°??????????????????????
					// (4.1.1.2.1.1) ??????????°??????????????????????????????¨
                    //               ????±???¨??????1?????????ASCII?????????????????´????????´?????\?????????????????????
						// (4.1.1.2.1.1.1) count?????°???????¢???????
		// (4.1.2) ??¢???????????????????????°????????\?????????????????????
			// (4.1.2.1) ??¢????????????????????¨count??????????????¨?????????

public class Main {

	public static void main(String[] args) throws IOException {
		final char ASCII_CODE_BASE = 97;

		int counts[] = new int[26];


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

		String str;
		while((str = br.readLine()) != null) {

			for (int i = 0; i < str.length(); i++) {
				char c = str.charAt(i);
				if(Character.isAlphabetic(c)) {
					char lowerChar = Character.toLowerCase(c);
					counts[lowerChar - ASCII_CODE_BASE]++;
				}
			}
		}

		for (int i = 0; i < counts.length; i++) {
			System.out.println((char)(i+ASCII_CODE_BASE) + " : " + counts[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