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: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']

A: 15879
****
Q: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

A: 27157
****
Q: ['1451', '3939', 'S', '439', '9679', '3691', '6883', 'I', 'M', '857', 'R']

A:
26939
****