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]: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
[EX A]: 5636

[EX Q]: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']
[EX A]: 32029

[EX Q]: ['8709', '4421', '4367', '7639', 'H', 'T', '2041', 'J', 'd', 'x', 'l', '2957', '9205', '2193', 'R', 'u', '9343']
[EX A]:
50875