input: Write a python function to find the product of all elements in a sequence.
  assert product_of_sequence([2, 3, 4]) == 24
  assert product_of_sequence([1, 5, 7, 9]) == 315
  assert product_of_sequence([10, 10, 10]) == 1000
output: def product_of_sequence(seq):
      product = 1
      for num in seq:
          product *= num
      return product