import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int nums = 1;
		int num = 1;
		for(int i = 0; nums != 0 ; ++i,num++) {
			nums = scan.nextInt();
			if(nums == 0) break;
			System.out.println("Case " + num + ": " + nums);
		}

 }
}
/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