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: ['r', '6537', '3001', '7879']

A: 17417
****
Q: ['h', '1157', 'm', '8975', '6165', '7491', '1855', '3489', '9629', '631', '9641']

A: 49033
****
Q: ['7517', 'a', 'Q', '8473', 'a', 'g', 'l', 'a', '4943', 'u', '7033', 'm']

A:
27966
****