input: Write a python function to find the minimum and maximum values of each sublist in a list of lists.
  assert findMinMax([[8, 4], [6, 2, 3], [1, 9, 7]]) == ([4, 2, 1], [8, 6, 9])
  assert findMinMax([[10, 15, 3], [1, 2, 8], [100, 50]]) == ([3, 1, 50], [15, 8, 100])
  assert findMinMax([[5], [2, 3], [8, 7, 6]]) == ([5, 2, 6], [5, 3, 8])
output: def findMinMax(lists):
      min_values = [min(sublist) for sublist in lists]
      max_values = [max(sublist) for sublist in lists]
      return (min_values, max_values)