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.

['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']
55013

['6731', 'f', '4561', '5601', 'i']
16893

['251', '2155', '5029', 'k', 'j', 'I']
7435