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.

['u', 'W', '1561', '9243', '4923', '9385']
25112

['7187', '5651', 'd', '4869', 'q', '2375', '3547']
23629

['4201', 'D']

4201