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]: ['f', 'H', 'U', 'l', 'n', 'q', '2701', '339', 'X', 'H', 'O', 'q', '2313']
[EX A]: 5353

[EX Q]: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
[EX A]: 14215

[EX Q]: ['7853', '3775', 'J']
[EX A]:
11628