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]: ['p', 'V', '673', '8483', 'S']
[A]: 9156


[Q]: ['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']
[A]: 35388


[Q]: ['H', '2799', '2545', '2805', '2635', '345', 'g', 'a', '4747', 'Y']
[A]:
15876