/* ITP1_9-B */
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
class Main {
	public static void main(String[] args) throws IOException {
                BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();
		int count = 1;
		while(!str.equals("0")) {
			System.out.println( "Case " + count + ": " + str );
			count++;
			str = br.readLine();
		}
	}
}
/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