input: 
  def square_root(x):
      """ Compute the square root of the input number.
      Raise a TypeError if the input is not an integer.
      >>> square_root(4)
      2.0
      >>> square_root('four')
      Traceback (most recent call last):
      ...
      TypeError: Input must be an integer
      """
      if not isinstance(x, int):
          raise TypeError('Input must be an integer')
      return x**0.5
  
output:     if x < 0:
          raise ValueError('Input must be a non-negative integer')