import java.util.Scanner;

class Main{
    public static void main(String[] args){
    	Scanner scan = new Scanner(System.in);
    	int count = 0;

    	while(true){
    		count++;
    		int x = scan.nextInt();

    		if(x == 0){
    			break;
    		}

    		System.out.println("Case " + count + ": " + x);
    	}
    }
}
/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