import java.util.*;

class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int x,i=0;
		while(true){
			i++;
			x = in.nextInt();
			if(x == 0) break;
			System.out.println("Case " + i + ": " + 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