In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
['7601', 'I', 'E', 'C', 'T', '4631', '2217', '3535', '4085', '3527', '663', '6267', 'B', 'U', 'd', 'f', '9111', 'F', 'A', '9081']