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.

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

['6293', 'o']
6293

['8333', '4595', '7647', 'v', 'l', 'S', '9439']

30014