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]: ['w', '7301', '9411', 'z', 'g', 'X', '1045', 'l', 'F', 'M', 'R', '7957', 'e', '5145']
[A]: 30859


[Q]: ['2787', 'z', '9351', '3339']
[A]: 15477


[Q]: ['6881', '3157']
[A]:
10038