import java.util.Scanner;
class Main
 {
   public static void main(String[] args)
      {
      Scanner stdln = new Scanner(System.in);
      int x,i=1;
      while(true){
      x = stdln.nextInt();
      if (x==0)break;
        System.out.printf("Case %d: %d\n", i++, x);
      }
 }
}


/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