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.

['q', '5151', 'R', '441']
5592

['2151', '7511']
9662

['6303', '3349', 'a', '8499', '3289', 't', 'Q', '5925', 'x']

27365