You will be given a definition of a task first, then some input of the task.
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.

Context: Becky went to the zoo with her friend. They walked to the back of the zoo. They saw Chimpanzees at the back of the zoo. Becky made a funny face and danced in front of the Chimp. 
 Sentence: The Chimp responded by defecating and tossing feces at Becky. 
 Character: Becky's friend
Output:
None