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

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

[EX Q]: ['5431', 'X', '2951', 'w', '653', 'u', 'l', 'Z', 'W', '8661', '9235', 'P', 'R', 'S', '9789', '1607', 'M', '5497', 't', 'm']
[EX A]:
43824