<human>:  code for calculating manhattan distance in 2D.
<bot>: Here is a Python program to calculate manhattan distance in 2d

import random

def manhattan_distance(x1, y1, x2, y2):
  """
  Calculate manhattan distance between two points.

  Arguments:
    x1 (int): x coordinate of first point.
    y1 (int): y coordinate of first point.
    x2 (int): x coordinate of second point.
    y2 (int): y coordinate of second point.

  Returns:
    int: Manhattan distance between two points.
  """
  return abs(x1 - x2) + abs(y1 - y2)

# Enter the x1, y1, x2, y2
x1 = 1
y1 = 2
x2 = 3
y2 = 4

# Calling the function
print((manhattan_distance(x1, y1, x2, y2)))

#Remember to inspect code for bugs.