input: Write a function to identify the characters in a given alphabet string. The function should return a list of characters from the alphabet. If the input alphabet is empty, return an empty list.
  assert identify_characters('ABCDEFGHIJKLMNOPQRSTUVWXYZ')==['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
  assert identify_characters('')==[]
  assert identify_characters('abc')==['a', 'b', 'c']
  assert identify_characters('12345')==['1', '2', '3', '4', '5']
  assert identify_characters('@#$%^')==['@', '#', '$', '%', '^']
output: def identify_characters(alphabet):
      return list(alphabet)