Task: Story Composition
Input (English): Premise: Jack went to shop for groceries when his mom asked him to do so. 
 Initial Context: While at the shopping complex, he saw a beautiful piano. 
 Original Ending: He played it for sometime after seeking the permission. He then returned to home and asked his mom for buying a piano. His mom agreed and he was happy playing it. 
 New ending: He played it for sometime after seeking the permission. He then returned to home and asked his mom for buying a guitar. His mom agreed and he was happy playing it. 
Output (English): While at the shopping complex, he saw a beautiful guitar.