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]: ['X', 'f', 'p', 'R', 'N']
[A]: 0


[Q]: ['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']
[A]: 33659


[Q]: ['b', '7939', 'U', 'y', '5153', 'S', '8501', 'u', 'u', '8917', 'D']
[A]:
30510