input: Write a python function to count even and odd numbers in a list.
  assert count_even_odd([1, 4, 5, 7]) == (1, 3)
  assert count_even_odd([2, 4, 6, 8]) == (4, 0)
  assert count_even_odd([1, 3, 5, 7]) == (0, 4)
  assert count_even_odd([1, 2, 3, 4, 5, 6]) == (3, 3)
output: def count_even_odd(lst):
      even_count = 0
      odd_count = 0
      for num in lst:
          if num % 2 == 0:
              even_count += 1
          else:
              odd_count += 1
      return (even_count, odd_count)