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: ['B', 's']

A: 0
****
Q: ['85', '2123', '605', '167', 'e', '7657', 'Y', '8759', 'S', 'Z', '2783']

A:
22179
****