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]: ['2683', '4431']
[EX A]: 7114

[EX Q]: ['3809', '9401', '63', '5705', 'u', '6275', 'k', 'l', '1171', '9365', 'L', 'O', '7431', '8567', 'h', '6135']
[EX A]: 57922

[EX Q]: ['R', 'u', 'a', 'X']
[EX A]:
0