input: Write a python function to find the first number greater than 10 in a list.
  assert find_number_greater_than_10([1, 2, 11, 20, 6, 7]) == 11
  assert find_number_greater_than_10([5, 8, 10, 12, 14]) == 12
  assert find_number_greater_than_10([3, 9, 10, 7, 6, 5]) == None
output: def find_number_greater_than_10(lst):
      for num in lst:
          if num > 10:
              return num
      return None