Given the task definition, example input & output, solve the new input case.
In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
Example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Output: How many books are there in the British Library?
In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input case for you: Article: Once upon a time there was a monster . He was very ugly and had no friends. No one wanted to talk to him. Even other monsters thought he was ugly. He lived alone and was very unhappy because he was so lonely. "I wish I had a friend." He said to himself every day, "One friend would be enough. Someone to talk to." He wrote a letter to a magazine. The magazine gave people advice. "Dear Editor," he wrote, "I am a ugly monster. How can I find a friend?" "Dear monster," the Editor replied, "Advertise for a friend in this magazine." The monster wrote an advertisement. "Monster wants a friend, male or female. I have two heads, four arms, six legs and three tails. I have one blue eye, one green eye and one brown eye. Smoke comes out of my nose. But I am really a kind monster and will be a good friend to someone. If you would like to meet me, please stand outside Blake's Store at 6 p.m. on Friday, May 7th. Write to Mr. A, Box 45, everybody's Magazine." A few days later he went to the magazine. "Do you have any letters for Box 45?" he asked. The clerk looked in Box 45. "Yes, there is one." She said, and gave it to him. The monster opened the letter, and read, "Dear Monster, I think a person's character is more important than his appearance. I will wait outside Blake's Store on Friday. Please carry a flower so that I will recognize you. Yours sincerely, Miss Alice Thwaite."
Answer: He had no friends.
Output:
Why was the monster unhappy?