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]: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']
[EX A]: 12538

[EX Q]: ['8109', '5635', 'u', 'M', '1009']
[EX A]: 14753

[EX Q]: ['X', '4479', 'g', 'V', 'n']
[EX A]:
4479