import java.io.*;

class Main {

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      int x = Integer.valueOf(br.readLine()).intValue();
      int i = 1;
      while (x != 0) {
         System.out.println("Case " + i + ": " + x);
         i++;
         x = Integer.valueOf(br.readLine()).intValue();
      }
   }
}
/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