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]: ['X', 'f', 'p', 'R', 'N']
[A]: 0


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


[Q]: ['5903', 'l', '871', 'Z', 'H', '8447', 'a', '3083', '5685', '5701', 'k', '2039', 'g', 'f', '6709', '7807']
[A]:
46245