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.

['L', 'w', '2783', '6993', 'd', '9173']
18949

['p', 'V', '673', '8483', 'S']
9156

['2933', 'k', '7063', '2851', 'w', '7095', 'M', '8363', 'y', 'T', '911', '9455', 'm', 'p', 'f', 'K', 'N', 'k', 'N', '8141']

46812