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]: ['r', 'B', '8791', '3165', 'n', 'm']
[A]: 11956


[Q]: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
[A]: 30645


[Q]: ['q', '5641', 's', 'E', '6989', '9083', '2597', '1171', '7979']
[A]:
33460