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]: ['7959', '1345', '4605', '6453', 'Q']
[A]: 20362


[Q]: ['o', 'L', 'E', 'V', 'D', 's', 'Z', 'm', 'a', '2785', 'I', 'v', 'B', '7909', '1599', 'V', 'N']
[A]:
12293