input: Write a python function to find the largest and smallest number from a given list of numbers.
  assert find_num([7, 4, 2, 9, 0, 5]) == (9, 0)
  assert find_num([3, 8, 1, 5, 2]) == (8, 1)
  assert find_num([-2, -6, -3, -9, -1]) == (-1, -9)
output: def find_num(numbers):
      largest = max(numbers)
      smallest = min(numbers)
      return (largest, smallest)