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]: ['j', 'R', '2435']
[A]: 2435


[Q]: ['7067', 'E', 'C', '1879', 'Z', 'u', 't', '2053', '6769', 'r', '5207', '7009', 'H', '5587', 'i', 'M', '1357', 'A']
[A]: 36928


[Q]: ['E', '2809', '7', 'N', '5915', '1801', 'W', 'y', 'v', 'k', '957', 'P', '3399']
[A]:
14888