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]: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
[A]: 44216


[Q]: ['W', 'H', 'k', 'L', '2425']
[A]: 2425


[Q]: ['g', 'v']
[A]:
0