Task: Story Composition
Input (English): Premise: Jon and his pals picked up rocks along the tracks. 
 Initial Context: They had fun smashing the rocks with hammers. 
 Original Ending: They were surprised to find the rocks looked different inside. Jon remembered his uncle had a rock collection. He planned to find out what was inside those rocks. 
 New ending: They were surprised to find the rocks looked different inside. Jon remembered his uncle had a rock collection. He planned to find out what was inside those rocks. 
Output (English): They had fun carefully stacking the rocks.