Input (grade 9): December 29, 1877) was the daughter-in-law of the 8th United States President Martin Van Buren.
Output (grade 10): Angelica Singleton Van Buren (February 13, 1818 - December 29, 1877) acted as the First Lady of the United States. She was the daughter-in-law of Martin Van Buren, the 8th president of the USA.