input: from typing import List
  
  def merge_sort(A: List[int], B: List[int]) -> List[int]:
      """ Implements a merging algorithm for two sorted lists A and B. The algorithm compares 
      the first elements of both lists and appends the smaller one to the result list. It then 
      moves the pointer of the list from which the element was taken to the next element. 
      This process continues until all elements from both lists are examined.
      >>> merge_sort([3, 6, 8, 10, 11], [2, 5, 7, 12])
      [2, 3, 5, 6, 7, 8, 10, 11, 12]
      """
      result = []
      i, j = 0, 0
  
      # Compare elements and add lower one to result
      while i < len(A) and j < len(B):
          if A[i] < B[j]:
              result.append(A[i])
              i += 1
          else:
              result.append(B[j])
              j += 1
  
      # Add remaining elements
      result += A[i:]
      result += B[j:]
  
      return result
output:     return result