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]: ['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']
[A]: 21910


[Q]: ['k', 'Z', 'r', 'K', 'b', 'X', 'A']
[A]: 0


[Q]: ['2771', 'A', '1613', 'M', '6499', '9411', 'A', '1135', '5587', 'J', 'j', 'X', 'j', '7469', 'y']
[A]:
34485