what does the saying mind your p's and q's mean???

Answer: mind your language
Question: who wrote the house that built me lyrics?

Answer: Tom Douglas and Allen Shamblin
Answer this question: when does the regular season for the nhl begin??

October 4, 2017
Q: who is known as the last son of krypton?A: Superman
Input: what are all the countries in the united kingdom?

Output: Northern Ireland
input: What is the answer to this question? how many episodes are there in moon lovers?

output:
20