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]: ['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']
[A]: 45451


[Q]: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']
[A]: 17432


[Q]: ['M', 'g', '8971', '5903', 'r', 's', '2093', 'd', '8605', 'T', '7475', '4727', '9255', 'Z', 'X']
[A]:
47029