Generate a correct and concise answer for the question based on the words in the context.
Example: Context : Isaac Nicola Romero (1916 in Havana, Cuba -- 1997) was a prominent Cuban guitarist and one of the founders of the modern Cuban Guitar School. 
Question : What was Isaac Nicola's city of birth?
Example solution: Havana
Example explanation: According to context Issac Nicola's city of birth is Havana. Hence this is a correct output.

Problem: Context : By the end of 1977, the AK-63 was adopted by the Hungarian People's Army (beginning with the Ground Forces). 
Question : What year is AK-63 associated with?

Solution: 1977