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: ['s', 't', 'W', '163', 'v']

A: 163
****
Q: ['y', 'R', 'b', 'v', 'm', 'H', '9903', '8689', 'D', '1023', 'a', '233', '1833', 'o', 'n', 'm', '5531']

A: 27212
****
Q: ['4763', 'b', '3211']

A:
7974
****