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.

[EX Q]: ['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']
[EX A]: 27899

[EX Q]: ['y', 'R', 'b', 'v', 'm', 'H', '9903', '8689', 'D', '1023', 'a', '233', '1833', 'o', 'n', 'm', '5531']
[EX A]: 27212

[EX Q]: ['2879', '4579', '7513', '5773', 'L', 'W', '7005', 'C', '2309', 'r', 'O', '1899']
[EX A]:
31957