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: ['3839', 'D', '4741', 'L']

A: 8580
****
Q: ['d', '4553']

A: 4553
****
Q: ['8127', 'D', 'W', 'j', 'c', 'I', 'b', '4589', '1185', '33', 'J', '4437', 'A', 'U', '1879', 'f']

A:
20250
****