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: ['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']

A: 38819
****
Q: ['y', 'B', '2517', 'S', 'D', '6731', 'N', 'u', 'i', '3603', '1863', 'v', '4145']

A:
18859
****