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

A: 38819
****
Q: ['6957', '4603', '5299', '8451', '9803', 'b']

A: 35113
****
Q: ['6023', 'T', '2591', '4771', '3777', '1875', '5', 'w', '3291', 'e']

A:
22333
****