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: ['c', '4501', 'O']

A: 4501
****
Q: ['X', 'f', 'p', 'R', 'N']

A: 0
****
Q: ['L', '4569', '803', 'W', '953', '4923', '5995', '193', 'k', '6017', '8083']

A:
31536
****