import java.util.Scanner;

public class Main{

      public static void main (String[] args){
             Scanner in = new Scanner(System.in);
             StringBuilder bu = new StringBuilder();
            
             int num = 0;
             int i = 1;
         
             while(true){
                  num = Integer.parseInt(in.next());
                  if(num == 0){
                    break;
                   }

              bu.append ("Case " + i + ": "+ num + "\n");
             i++;
           }
         System.out.print(bu);
   }
}
/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