input: def find_largest_number(numbers: List[int]) -> int:
      """ Find the largest number in a given list of integers.
      >>> find_largest_number([1000, 506, 299, 620, 35])
      1000
      """
      max_num = 0
      for num in numbers:
          if num > max_num:
              max_num = num
      return max_num
output:     max_num = numbers[0]
      for num in numbers:
          if num > max_num:
              max_num = num
      return max_num