Definition: You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.
Input: Last week, FBI Director Louis Freeh, on an official visit to Mexico, asked Mexican authorities to join the hunt for Kopp, federal officials have said. They (believe) Kopp was driven to Mexico by a female friend after the shooting, and have a trail of her credit card receipts leading to Mexico, the federal officials have said.  
 Verb: believe
Output:
No