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]: ['2775', '7405', 'F', 'D', '9025', '827', 'e', 'j', 's', 'e', 'Q', '1137', 'G']
[A]: 21169


[Q]: ['3629', '8785', '9537', '8479', '3523', 'c', 'C', '5093', '2405', 'y', '1145', '8987', 'f']
[A]: 51583


[Q]: ['b', 's', '665', 'z', 'W', 'h', 'P', '5095', 'P', 'U']
[A]:
5760