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', 'W', '1561', '9243', '4923', '9385']
25112

['I', '7815']
7815

['9219', '9953', '9513', '3749', '783', '9385', '7993']

50595