import java.util.Scanner;

public class Main {
	public static void main(String [] args){
        Scanner scan = new Scanner(System.in);
        int c = 1;
        
        while(true){
            int n = scan.nextInt();
            
            if(n == 0) break;
            
            System.out.println("Case " + c++ + ": " + n);
        }
    }
}
/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