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', 'W', 'V', 'R', '3761', 'U', '4553', '1803', 'W', '7775', '1067', 'Y', 'D', '3159']
22118

['F', 'z', '1159', '345']
1504

['5289', 'i', 'O']

5289