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]: ['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
[A]: 64261


[Q]: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
[A]: 33888


[Q]: ['3151', 'L', '6793', '4533', '6525']
[A]:
21002