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: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']

A: 12538
****
Q: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']

A: 39921
****
Q: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

A:
35729
****