Task: Story Composition
Input (English): Premise: Mark was an American spy during the Cold War. 
 Initial Context: He was told to steal a document from the Russians in Berlin. 
 Original Ending: At night, he snuck up to the hidden building. A guard heard him, but did not see him sneaking inside. Mark stole the document and escaped easily. 
 New ending: In the morning, he walked up to the hidden building. A guard heard him, and saw him walking inside. Mark bought the document and left easily. 
Output (English): He was told to buy a document from the Russians in Berlin.