If-Else Statement-Positive and Negative Integers

I am just starting my first computer science class and have a question! Here are the exact questions from my class:

"Write a complete python program that allows the user to input 3 integers and outputs yes if all three of the integers are positive and otherwise outputs no. For example inputs of 1,-1,5. Would output no."

"Write a complete python program that allows the user to input 3 integers and outputs yes if any of three of the integers is positive and otherwise outputs no. For example inputs of 1,-1,5. Would output yes."

I started using the if-else statement(hopefully I am on the right track with that), but I am having issues with my output.

num = int(input("Enter a number: "))
num = int(input("Enter a number: "))
num = int(input("Enter a number: "))
if num > 0:
   print("YES")
else:
   print("NO")

I have this, but I am not sure where to go with this to get the desired answers. I do not know if I need to add an elif or if I need to tweak something else. If anyone could point me in the right direction, I would be very grateful!