import java.util.ArrayList;
import java.util.Scanner;

/**
 * Created 2017/06/01.
 */
  public class Main {
    public static void main(String[] args) {
      //??\?????¨?????????
      Scanner sc = new Scanner(System.in);
      ArrayList<Integer> ary = new ArrayList<>();

      while (true) {
        int input = Integer.parseInt(sc.next());
        ary.add(input);
        if (input == 0)break;
      }

      for(int i = 0; i < ary.size()-1; i++){
        System.out.println("Case " + (i+1) + ": " +ary.get(i));
      }

    }
  }
/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