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.

['9787', '1491', '4411', '5261', 'U', '9787', 'b']
30737

['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']
19001

['4571', '13', 'l', '8139', 'e', '2079', '8453', '85', '8907', 'D', 'V', 'l', '9237', 'c']

41484