With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Stanisław Herman Lem (; 12/13 September 1921 – 27 March 2006) was a Polish writer of science fiction and essays on various subjects, including philosophy, futurology, and literary criticism. Many of his science fiction stories are of satirical and humorous character. Lem's books have been translated into over 40 languages and have sold over 45 ;million copies. Worldwide, he is best known as the author of the 1961 novel "Solaris", which has been made into a feature film three times. In 1976 Theodore Sturgeon wrote that Lem was the most widely read science fiction writer in the world. Lem's science fiction works explore philosophical themes through speculations on technology, the nature of intelligence, the impossibility of communication with aliens, the possibility of the understanding of alien intelligence, despair about human limitations, and humanity's place in the Universe. His essays and philosophical books cover these and many other topics.
text_B: If aliens showed up on Earth, is it likely that Lem would think it's a waste of time to try to find a way to talk with them?
YES.