input: from typing import List
  
  def transpose(A: List[List[int]]) -> List[List[int]]:
      """ Optimize a Python program that processes a 2d array and stores the transpose output in a new array.
      >>> transpose([[1, 2, 3], [4, 5, 6]])
      [[1, 4], [2, 5], [3, 6]]
      >>> transpose([[7, 8], [9, 10], [11, 12]])
      [[7, 9, 11], [8, 10, 12]]
      """
      n = len(A)
      m = len(A[0])
  
      B = [[0 for x in range(n)] for x in range(m)]
  
      for i in range(n):
          for j in range(m):
              B[j][i] = A[i][j]
  
      return B
output:     n = len(A)
      m = len(A[0])
  
      B = [[0 for x in range(n)] for x in range(m)]
  
      for i in range(n):
          for j in range(m):
              B[j][i] = A[i][j]
  
      return B