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.

['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']
15672

['e', '6633', '131', '7459', '3733']
17956

['3783', 't', '6589', '6561', '2855', 'f', '7603', '6119', '6183', 'E', 'y', '225']

39918