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.

[Q]: ['k', '4991', '7289', '4355', 'I', '8415', '5175', '5329', 'G', 'a', '7193', 't', '8821', 'j', '7239', '405', 'y', 'O', '9881', 'w']
[A]: 69093


[Q]: ['j', 'f', '3831', 'B', 'D']
[A]: 3831


[Q]: ['s', '5409', 'T', 'f', '9305', '2833', 'D', '7787', '3723', '817', 'Y', 'K', '8337', '8945']
[A]:
47156