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: ['q', '5151', 'R', '441']

A: 5592
****
Q: ['3145', 'C', '7725', 'k', 'z']

A: 10870
****
Q: ['V', 'Z', '555']

A:
555
****