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


[Q]: ['2913', 'b', 'j', '7591', 'O', 's', '5589', '4995', '7503', 'U', 'S', 'C', '6797']
[A]: 35388


[Q]: ['6897', '5845', '4505', 'r', 'X', '3059', '6169', 'v', '459', 'm', 'J', 'E']
[A]:
26934