In this task, you're given a context, a sentence,  and a character. The sentence describes an action or job of the given character. Also, the context provides more information about the sentence or the character. Your task is to write the character's motivation by doing a specific job, which is given in the sentence. You can use context to find the motivation; however, all the inputs do not provide context. Also, in some inputs, there can be zero motivation; output, 'None' in this case.

Example Input: Context: None 
 Sentence: Lexie was so excited for Halloween. 
 Character: Boy
Example Output: None

Example Input: Context: Carrie wanted a new pet. Her friend told her to adopt one. Carrie went to the pet store. 
 Sentence: She adopted a cat. 
 Character: Friend
Example Output: None

Example Input: Context: Tom liked to box. He would practice all the time. 
 Sentence: He asked a friend to join him. 
 Character: Tom
Example Output:
to improve his ability