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.

['j', 'f', '3831', 'B', 'D']
3831

['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']
25914

['U', '2639', '4611', '1755', '5263', 'V', 'M', 'd', '3833', 'p', '3913', 'F', 'f', 'T', 'V']

22014