import java.io.*;

class Main {
	public static void main(String[] args){
		BufferedReader br = null;
		StringBuilder sb = new StringBuilder();
		final String lb = System.getProperty("line.separator");
		int[] count = new int[26];
		String str = null;
		try {
			br = new BufferedReader(new InputStreamReader(System.in));
			while((str = br.readLine()) != null){
				for(int i = 0; i < str.length(); i++){
					final char ch = str.charAt(i);
					if('A' <= ch && ch  <= 'Z'){
						count[ch - 'A']++;
					} else if('a' <= ch && ch <= 'z'){
						count[ch - 'a']++;
					} else {}
				}
			}

			for(int i = 0; i < count.length; i++){
				sb.append(String.valueOf((char)('a'+i))).append(" : ").append(count[i]).append(lb);
			}
			System.out.print(sb.toString());

		} catch(Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if(br != null){
					br.close();
				}
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
	}
}
/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