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.

[EX Q]: ['1305', '1673', 'w']
[EX A]: 2978

[EX Q]: ['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']
[EX A]: 35766

[EX Q]: ['3135', 'T', '9377', 'x', 'l', '3547', '8889', '8833', 'B', '7261', 'b', '765', 'j', '3799', 'Z', '491', 'd', '1677']
[EX A]:
47774