Input (grade 13): Ludwig Josef Johann Wittgenstein (26 April 1889 - 29 April 1951) was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.
Output (grade 10): April 29, 1951) was an Austrian philosopher. He worked mainly in the basics of logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.