import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
	Scanner scan = new Scanner(System.in);
	int count = 1;
	while(scan.hasNext()) {
	    String input = scan.next();
	    if (input.equals("0")) {
		break;
	    }
	    System.out.println("Case " + count++ + ": " + input);
	}
    }
}
/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