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]: ['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']
[A]: 15672


[Q]: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']
[A]: 39896


[Q]: ['C', '3351', 'h', 'P', '7215', 'D', '1099', 'O', 'K', 'G', 'i', '3873', 'u', '8221', '2221', '4989', '355', '689']
[A]:
32013