input: Write a function to generate an even number between 10 and 200 that is divisible by 5. If such a number cannot be generated, return -1.
  
  def generate_even_number():
      for num in range(10, 201):
          if num % 2 == 0 and num % 5 == 0:
              return num
      return -1
  
  assert generate_even_number() >= 10 and generate_even_number() <= 200
  assert generate_even_number() % 2 == 0
  assert generate_even_number() % 5 == 0
output: def generate_even_number():
      for num in range(10, 201):
          if num % 2 == 0 and num % 5 == 0:
              return num
      return -1