import java.util.Scanner;


public class Main {
	public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
for(int i=1; i<=10000;i++)
{
int a= sc.nextInt();
if(a==0) break;
System.out.println("Case " + i + ": "+ 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