import java.util.Scanner;
import java.util.Iterator;
public class Main{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		int line=0;
		for(int i = 1;input.hasNext();i++){
			line = input.nextInt();
			if(line!=0){
				System.out.println("Case "+i+": "+line);
			}else{
				break;
			}
		}
	}
}
/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