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.

['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
64261

['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']
20876

['3469', '8363', '821', '6869', '8655', 'Z', '4715', '3349', 'w', 'G']

36241