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', '4991', '7289', '4355', 'I', '8415', '5175', '5329', 'G', 'a', '7193', 't', '8821', 'j', '7239', '405', 'y', 'O', '9881', 'w']

A: 69093
****
Q: ['D', '1259', '8927', '3345', '553', '7209', '2507', 'l', 'o', '7317', '1227', '6749', 'S', '3171', 'I', '197', '9577', 'j', 'Q']

A: 52038
****
Q: ['5831', '4713', '8441', 'z', 'r', 'P']

A:
18985
****