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]: ['m', '6153', 'A', '6173', 'x', '7527', '8501', 'g', 'r', 'K', 'I', '3103', '8347']
[EX A]: 39804

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

[EX Q]: ['F', '5739', 'U', 'X', '7511', '7221', '8767', '509', '5279', '8171']
[EX A]:
43197