input: Write a python function to create a 3D line plot and a 3D surface plot using given x, y, and z coordinates.
  assert Plot3D([1, 2, 3], [4, 5, 6], [7, 8, 9]) is None
  assert MeshGrid([1, 2, 3], [4, 5, 6], [7, 8, 9]) is None
  assert Show() is None
output: import matplotlib.pyplot as plt
  from mpl_toolkits.mplot3d import Axes3D
  import numpy as np
  
  def Plot3D(x, y, z):
      fig = plt.figure()
      ax = fig.add_subplot(111, projection='3d')
      ax.plot(x, y, z)
      plt.close(fig)  # Close the figure to prevent it from displaying in an interactive environment
  
  def MeshGrid(x, y, z):
      fig = plt.figure()
      ax = fig.add_subplot(111, projection='3d')
      X, Y = np.meshgrid(x, y)
      Z = np.array(z).reshape(len(x), len(y))
      ax.plot_surface(X, Y, Z)
      plt.close(fig)  # Close the figure to prevent it from displaying in an interactive environment
  
  def Show():
      plt.show()