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]: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
[A]: 5636


[Q]: ['m', 'e', 'W', 'N', '4459', '693', '3765', '2641']
[A]: 11558


[Q]: ['8779', 'k', '1063', '4097', '6105', '6585', '3419', 'm', '1971', '4097', '4845', '3887', 't']
[A]:
44848