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: ['L', 'w', '2783', '6993', 'd', '9173']

A: 18949
****
Q: ['a', 'm', '3205', '1869', '1117', 'K', '5785']

A: 11976
****
Q: ['7807', '3411', '7603', '11', '1421']

A:
20253
****