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]: ['191', 'R', 'Q', '7809', '4851', 'b', 'e', 'H', 'E', 'I', 'r', 'A', 'g', 'e', 'g', 'I', 'j', 'f', '7287']
[A]: 20138


[Q]: ['29', 'N', '5061', '7191', 'z', '8367']
[A]: 20648


[Q]: ['7605', 'Q', '3255', 'A', '3401']
[A]:
14261