Task: Question Generation
Input (English): Passage: In Victorian London, an unseen criminal begins masterminding his "perfect plot on paper" which starts with a robbery taking place and three cats stealing a pink diamond. Three constables spot them and give chase, but the cats escape to the rooftops and glide off into the night, giving the stolen diamond to a mysterious horseman. The next day, Dr. Watson rushes to 221B in Baker Street and informs his colleague Sherlock Holmes of the robbery. Holmes then calls his pet mouse Jerry to bring him a copy of the Times. Jerry heads out to buy it while encountering Tom on the way, who also has something for Holmes. Jerry returns to Holmes' flat and hands him the paper or what was left of it after the chase. Reading a letter Tom had given to them for the night, Holmes and Watson decide to go to the Bruce Nigel Theatre where a performer named Red is seen. Holmes is told that she is being blackmailed and Holmes suggests who the perpetrator might be – Professor Moriarty. Holmes deduces that the Star of Punjab, a diamond that is light sensitive to the light of a solar eclipse which was to happen the following day, is to be stolen by the mastermind of the blackmail.
At the Punjab Embassy, Spike and Tyke are assigned to guard the Star of Punjab. Spike begins to teach Tyke how to be a good dog guard, but the three cats from the previous night steal the diamond while an unfocused Spike is not looking. The three cats then leave a small button and retreat. They climb out through a hole in Red's home that leads to the tunnel and escape before Holmes, Tom and Jerry arrive. Upon arriving, Jerry tricks Tom into stepping into a broken board and the trio check the tunnel. Finding sawdust, they retreat after hearing Tyke sounding the alarm. Holmes and Watson leave to find the shop where the button came from, while Tom and Jerry are left to take Red to Holmes' flat.
Output (English): What do the cats leave in place of the diamond?