input: Write a python function to generate a random password of given length using lowercase ASCII letters.
  assert len(generate_pass(8)) == 8
  assert len(generate_pass(12)) == 12
  assert len(generate_pass(5)) == 5
output: import random
  import string
  
  def generate_pass(length):
      return ''.join(random.choice(string.ascii_lowercase) for _ in range(length))