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', 'm', 'P', '2433', '6731']
[A]: 9164


[Q]: ['o', '8089', '2159', '943', '1255', 'w', 'Y', '3723', 'n', '7767', '2209', 'F', 'c', 'J', '5259', '4427', 'n', 'U']
[A]: 35831


[Q]: ['6575', '9659', 'P', 'a', '4793', '4367', 'U', 'V', '4665', '5417', 'x', 'i', '7555', 'G']
[A]:
43031