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: ['z', 'U', '6817', 's', '3731', 'M', 'I', '1095', 'l', '5993', '5207', 'e', 'L', '5361', 'v', 'g', '1963', '4829', '9541', '8261']

A: 52798
****
Q: ['b', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']

A: 40156
****
Q: ['b', 'y', '9603']

A:
9603
****