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.

['S', 'W', '2171', '6405', 'h', 'C', '1597', '7109', 'Q', 'p', '2747', 't', 'J', 'q', '1883', 'v', 'O']
21912

['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']
19142

['3809', 'T', '295', '6541', '2355', 'f', '509']

13509