input: Write a function to count and sum negative numbers in a list.
  assert sumNegatives([-2, 4, 3, -3, -4, 5]) == (3, -9)
  assert sumNegatives([0, -1, -2, -3, -4]) == (4, -10)
  assert sumNegatives([1, 2, 3, 4, 5]) == (0, 0)
output: def sumNegatives(lst):
      count = sum = 0
      for num in lst:
          if num < 0:
              count += 1
              sum += num
      return count, sum