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]: ['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']
[A]: 55057


[Q]: ['4161', 'E']
[A]: 4161


[Q]: ['665', 'Y', '5789', 'N', 'K', '6909', 'x', '2385', '5199', '8941', 'y', '769', 'q']
[A]:
30657