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.

['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']
28173

['G', 'e', 'R', '4427', '3401', '3065', 'I', '2781', '6829', '5261']
25764

['1855', '841', '7669', '4967', 'P', 'd', '9687']

25019