import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner kbScanner = new Scanner(System.in);
		int input, count = 1;
		
		while((input = kbScanner.nextInt()) != 0){
			System.out.println("Case " + count + ": " + input);
			count++;
		}
	}
}
/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