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.

['7465', 'G', '105', 'A', '3987', 'O', '7385', 'C', '8957']
27899

['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
44216

['A', 'y', '331', '1147', 'H']

1478