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 input: 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.
Example output: How many books are there in the British Library?
Example explanation: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.
Q: Article: A group of people decided to climb a mountain together. They thought it was going to be an easy climb, so they laughed and talked among themselves and didn't notice the sky growing darker. They soon got lost for they couldn't see very far in front of them. They _ together that night over a fire. No one walked too far away from the group by themselves because it would surely lead to death. They sat close to each other throughout the dark hours not just for warmth, but for the fact that staying with the group was their only hope for survival. After what felt like a century, the sun started its slow climb up the sky. They were now able to see as far ahead of them as they liked, so they began to go down the mountain. They still remained as a group at this time even though there was no real need. A bond had formed throughout the group that could not be broken or ignored. They knew each other just as well as they knew themselves. As they reached the place where they had started their journey, they knew it was time to say goodbye. Feeling at peace, they bowed deeply to each other. All of them kept the love they created as a group close to their hearts as they made their way out into the world alone.
Answer: Running out of food.
A:
What was the difficulty the group of people met in the mountain?