import java.util.Scanner;
class Main {
    public void kami() {
           Scanner sc = new Scanner(System.in);
		int i = 1;
		int x = sc.nextInt();
		while(x != 0){
			System.out.println("Case " + i + ": " + x);
			i++;
			x = sc.nextInt();
		}

    }
    public static void main(String[] args) {
    new Main().kami();
     	}

}
/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