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: ['t', '7469', 'Y', 'N', '8137']

A: 15606
****
Q: ['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']

A: 55057
****
Q: ['t', 'B', 'B', 's', '2193', 'o', 'W', '8797', '5951', '935', '2403', 'o']

A:
20279
****