import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		ArrayList<Integer> n = new ArrayList<Integer>();

		while(sc.hasNextInt()){
			int value = sc.nextInt();
			if(value != 0){
				n.add(value);
			}
			else{
				break;
			}
		}

		for(int i = 0; i < n.size(); i++){
			System.out.println("Case " + (i + 1) + ": " + n.get(i));
		}
	}
}
/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