import java.util.Scanner;

public class Main{
    public static void main(String[]args){
        int count=0;
        Scanner scan = new Scanner(System.in);
        while(true){
            
            long a =scan.nextLong();
            if(a==0){
                break;
            }else{
                count++;
                System.out.println("Case "+count+": "+a);
            }
        }
    
        
        
    }
}
/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