public class Main{
  public void run(java.io.InputStream in,java.io.PrintStream out){
    java.util.Scanner sc = new java.util.Scanner(in);
/*????????§Input*/
    int i, n;
    for(i = 1;;++i){
      n = sc.nextInt();
      if(n != 0){
        System.out.println("Case " + i + ": " + n);
      }else{
        break;
      }
    }
    sc.close();
/*answer*/
/*???????????±?????????????????\???????????????????????????????????????????????????????????¨??????*/

  }
  public static void main(String[] args){
    (new Main()).run(System.in,System.out);
  }
}
/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