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.

['5947', 'n', '9431', '7629', '7643', 'N', '141', '2353', 'l', 'F', '9665', '9489', 'X', '4905', 'H', 'L', '985']
58188

['X', 'f', 'p', 'R', 'N']
0

['403', '6947', '3163', 'f', '8695', '3433', '7761', '8699', 'i', '1625']

40726