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

['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
14215

['7705', 'o', 'a', 'r', '3387', '65', '4367', '9887', '273', '3063', '4325', '4751', '193', 'U', 'a', 'F', '1569', 'L']

39585