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: ['543', '8351', 'I', 'M', '6647', '731', 'b', 'r', 'l', '3935', 'k', 'z', 'v', '2131', '7781', 'X', '9419', '5013', 'F']

A: 44551
****
Q: ['6917', 'b', '4747', 'c', 'P', '4913', 'E', 's', '1871', 'c', '5421', '959', 'J', '4647']

A:
29475
****