input: Write a function to determine whether a given number is even or odd. If the number is even, return "Even"; if the number is odd, return "Odd".
  def even_or_odd(num):
      if num % 2 == 0:
          return "Even"
      else:
          return "Odd"
  assert even_or_odd(4) == "Even"
  assert even_or_odd(7) == "Odd"
  assert even_or_odd(0) == "Even"
  assert even_or_odd(-3) == "Odd"
  assert even_or_odd(-10) == "Even"
output: def even_or_odd(num):
      if num % 2 == 0:
          return "Even"
      else:
          return "Odd"