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.

['U', '5607', 'Q', 'j', 'I', '3745', '3031']
12383

['f', 'H', 'U', 'l', 'n', 'q', '2701', '339', 'X', 'H', 'O', 'q', '2313']
5353

['2353', '1949', '4387']

8689