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: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']

A: 33888
****
Q: ['6217', 'A', '1925', 'o', '1433']

A: 9575
****
Q: ['2733', 'D', 'k', '909', '629', '4345', '6887', '3091', '7605', 'k', '407', 'X', '8269', '4625', 'w', 'e']

A:
39500
****