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]: ['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']
[A]: 24720


[Q]: ['q', '5151', 'R', '441']
[A]: 5592


[Q]: ['u', '631', 'P', 'y', '8163', '39', '5693', 'o', 'W', '7601', 'U', 'v', '5411', 'Q', 'X', 'F', 'p', 'a', '3259', '1133']
[A]:
31930