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]: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']
[A]: 12538


[Q]: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']
[A]: 28054


[Q]: ['5783', '8943', '4869', 'S']
[A]:
19595