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]: ['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']
[A]: 17914


[Q]: ['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']
[A]:
44566