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.
['9481', 'I', '8113', 'p', '1215', 'B', 'j', '4259', '8667', 'r', 'S', 'E', 'T', 'x', 'd', 'l', '7757', '2887', 'v']