input: Write a function to find the two largest numbers in a list.
  assert findLargest([1, 5, 2, 9, 6, 8]) == (9, 8)
  assert findLargest([10, 20, 30, 40, 50]) == (50, 40)
  assert findLargest([-1, -2, -3, -4, -5]) == (-1, -2)
  assert findLargest([3, 7, 2, 7, 5]) == (7, 7)
output: def findLargest(nums):
      if len(nums) < 2:
          return None
      first, second = float('-inf'), float('-inf')
      for num in nums:
          if num > first:
              first, second = num, first
          elif num > second:
              second = num
      return (first, second)