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.
['b', '3681', '4913', '7045', 'd', '773', '5253', '6817', 'o', '129', '5183', '327', '1213', '4285', '1851', 'v', '9113', '2699', 'j']