import java.util.Scanner;
class Main{
	
	Scanner sc = new Scanner(System.in);
	int x;
	int i;
	
	void rp2(){
		
		x = sc.nextInt();
	
		for(i=1; x!=0; i++){
			System.out.println("Case "+i+": "+x);
			x = sc.nextInt();
		}
	}
	
	public static void main(String[]agrs){
		new Main().rp2();
	}
}
	
/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