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]: ['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']
[EX A]: 44566

[EX Q]: ['x', '1305', 'b', '8193']
[EX A]: 9498

[EX Q]: ['K', 's', 'h', 'f', 'x', '2041', 'b', 'v', 'e', 'b']
[EX A]:
2041