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.

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


[Q]: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']
[A]: 39416


[Q]: ['T', '8333', 'C', 'Z', 'n', '1419', 'd', '3205', 'D', '1187', 'd']
[A]:
14144