input: from typing import List
  
  def find_largest_number(lst: List[int]) -> int:
      """
      Find and return the largest number in the given list of integers.
  
      >>> find_largest_number([1000, 506, 299, 620, 35])
      1000
      >>> find_largest_number([-1, -5, -10, -3, -7])
      -1
      """
      
      max_num = lst[0]  # Assume the first element is the largest
  
      for num in lst:
          if num > max_num:
              max_num = num
  
      return max_num
output:     max_num = lst[0]  # Assume the first element is the largest
  
      for num in lst:
          if num > max_num:
              max_num = num
  
      return max_num