A question that is free of any grammatical or logcal errors, should be labeled 'yes', otherwise it should be indicated as 'no'. A question is grammatically correct if all its entities i.e. nouns, verbs, adjectives, prepositions, pronouns, adverbs are at appropriate position. A question is logically correct if the semantic makes sense.

Input: Consider Input: Sentence: In Malaysia, Powell met with Prime Minister Mahathir Mohamad, who has led the country since 1981. 
Question: How often does Powell travel to other countries to meet their leaders?

Output: Yes.


Input: Consider Input: Sentence: He them imprisons the royal family in his prison . 
Question: Were the royal family members ever sent back to prison?

Output: No.


Input: Consider Input: Sentence: In the aftermath of Massaga and Ora, numerous Assakenians fled to the fortress of Aornos. 
Question: What did the Assakenians do next?


Output: Yes.


