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]: ['6787', 'W', 'I', '4929', 'j', 'I', '3487', 'F', '3927', 'Q', 's', 'X', '9939', 'n']
[EX A]: 29069

[EX Q]: ['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']
[EX A]: 37812

[EX Q]: ['Y', '6111', 'p', '2651', '4085', 'd', 'c', 'D', '453', 'R', '9163', 'S', 'y', 'P', '5753', '8429', '1247', 'Q', 'O']
[EX A]:
37892