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]: ['9403', 'u', '4159', 'w', '3467']
[A]: 17029


[Q]: ['X', 'u', 'B', '269', '9089', 'M', '5175', 'K']
[A]: 14533


[Q]: ['V', '6615', 'R', 'N', '9251', 'G', '699', 'V', 'l', 'O', 'l', '1347', '1171', '2015', '9479']
[A]:
30577