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: ['Q', '2271', '1803', '2363']

A: 6437
****
Q: ['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']

A: 33985
****
Q: ['7259', 'y', '2647', 'r', 'X', 't', 'M', 'R']

A:
9906
****