Task: Story Composition
Input (English): Premise: Four friends like to ride horses. 
 Initial Context: They went and caught mustangs. 
 Original Ending: The four friends domesticated the mustangs. The friends rode the horses from mexico to canada. The four friends never forgot that trip. 
 New ending: The four friends domesticated the donkeys. The friends rode the donkeys from mexico to canada. The four friends never forgot that trip. 
Output (English): They went and caught donkeys.