Task: Story Composition
Input (English): Premise: Mark spent the day at the arcade. 
 Initial Context: He found a pinball machine that gave out a lot of tickets. 
 Original Ending: Mark played the pinball machine for three hours that day. His thumbs hurt, but he won 5000 tickets. Mark redeemed his 5000 tickets for a huge stuffed dog for his sister. 
 Counterfactual Context: He found a skeet ball machine that gave out a lot of tickets.
Output (English): Mark played the machine for three hours that day. His thumbs hurt, but he won 5000 tickets. Mark redeemed his 5000 tickets for a huge stuffed dog for his sister.