import java.util.Scanner;

public class Main {
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  int tmp,case_num = 1;
  while((tmp = sc.nextInt()) != 0){
   System.out.printf("Case %d: %d\n",case_num++, tmp);
  }
 }
}

/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