import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner stdin = new Scanner(System.in);
        int i =1;
        int a = stdin.nextInt();
	while(a!=0){
	    System.out.println("Case "+i+":"+" "+a);
	    i++;
	    a = stdin.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