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', '2251', 'X', 'H', 'a', '5463', 'g', 'M', '9797', '1581', 'o', 'm', 'v', 'E']
[EX A]: 19092

[EX Q]: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']
[EX A]: 15208

[EX Q]: ['m', 'f', '8029', '3243', 'R', '8089', 'I', '8131', '4543', 'M', '5493', '1657', 'v', '9687', '8477']
[EX A]:
57349