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]: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
[A]: 44216


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


[Q]: ['Z', '3069', 'n', '7875', 'a', 'C', 'H', 'Q', 'n', '5263']
[A]:
16207