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: ['B', 's']

A: 0
****
Q: ['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']

A: 35766
****
Q: ['u', 'X', 'I', '5061', '877', 'l', 'B', 'U']

A:
5938
****