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: ['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']

A: 34296
****
Q: ['q', '5151', 'R', '441']

A: 5592
****
Q: ['X', 'W', 'e', 'W', 'y', '4481', '5439']

A:
9920
****