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]: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']
[EX A]: 8039

[EX Q]: ['s', 'M', 'U', '5383']
[EX A]: 5383

[EX Q]: ['I', 'i', 'U', '2609', '9435', '5499', 'y', '6391', 'I', '7363', 'w', '2601', 'y', 'n', '8463', '7657']
[EX A]:
50018