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', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

A: 30645
****
Q: ['L', 'w', '2783', '6993', 'd', '9173']

A: 18949
****
Q: ['H', '9913', 'G', 'V', '9285', '4949', 'K', '6817', 'C']

A:
30964
****