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.

['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
56499

['6787', 'W', 'I', '4929', 'j', 'I', '3487', 'F', '3927', 'Q', 's', 'X', '9939', 'n']
29069

['T', 'C', '3837', 'J', 'B', '6689', 'H', '9257', '1567', '6417', 'F', '7907', 'y']

35674