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]: ['D', 'K', 'n', 'd', 'i', 'U']
[A]: 0


[Q]: ['X', 'u', 'B', '269', '9089', 'M', '5175', 'K']
[A]: 14533


[Q]: ['6799', 'i', 'z', '5301', '413', '2657', '9665', '3747', 'R', '6671', '337', 'j', 'q', 'K', '3743', 'j', 'b', 'H', 'x', 'S']
[A]:
39333