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: ['j', 'R', '2435']

A: 2435
****
Q: ['4161', 'E']

A: 4161
****
Q: ['3831', 'V', 'm', 'k', '6651', '4607', 'O', 'f', 'g', '4699']

A:
19788
****