import java.util.Scanner;
public class Main{
    public static void main(String a[])
    {
	Scanner scan = new Scanner(System.in);
	int i=1;
	int x;
	while(true)
	    {
		x = scan.nextInt();
		if( x != 0 )
		    {
			System.out.println("Case "+i+": "+x);
			i++;
		    }
		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