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.

['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']
42641

['9863', 'y']
9863

['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']

32299