import java.util.Scanner;
class Main{
    public static void main(String[] args){
	final Scanner sc=new Scanner(System.in);
	int count = 0;
	int i=sc.nextInt();
	while(i!=0){
	    count++;
	    System.out.println("Case "+count+": "+i);
	    i=sc.nextInt();
	}
    }
}
/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