import java.util.Scanner;

public class Main {


    public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int data, cnt = 0;
		while(true){//?????????????????????????????§????????????
			data = scan.nextInt();
			if(data == 0){
				break;
			}
			System.out.println("Case " + ++cnt +  ": " + data);
		}
        scan.close();
    }
}
/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