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]: ['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']
[A]: 31031


[Q]: ['D', 'R', 'Y', '4929', 'P', '7929']
[A]: 12858


[Q]: ['6551', '1771', '8319', '5403', 'e']
[A]:
22044