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]: ['r', '3139', 'C', 'L', '7335', 'v', '9861', 'F']
[EX A]: 20335

[EX Q]: ['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
[EX A]: 33416

[EX Q]: ['5285', 'U', 'I', 'b', '3179', 'W', '6447', 'c']
[EX A]:
14911