input: Write a python function to return the first N alphabets from the given list.
  assert first_n_alphabets(5) == ['a', 'b', 'c', 'd', 'e']
  assert first_n_alphabets(10) == ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
  assert first_n_alphabets(0) == []
output: def first_n_alphabets(n):
      return [chr(i) for i in range(97, 97 + n)]