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: ['L', 'w', '2783', '6993', 'd', '9173']

A: 18949
****
Q: ['9661', '4607', 'j', 'd', 'h']

A:
14268
****