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: ['K', '479', 'u', '3489', 'o', '9589', '7153', '7649', '123', 'a', 'A', '3951', '847', 'N', 'R', '947', '9243', 'G', 'a']

A: 43470
****
Q: ['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

A: 59148
****
Q: ['c', '7537', 'e', 'L', 'z', '4965', '1077', '7267', '1167', '2205', 'Z', 's', 'j', '1461', '9411', '2655', '4915', '1283', '7737']

A:
51680
****