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.
--------
Question: ['z', 'j', 'M', 'E', '1689', '8413', '2603', 'b', '5101', 'w', 'r']

Answer: 17806


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

Answer: 14215


Question: ['n', 'z', 'N', 'w', 'T', 't', '563', '2617', 'W', '8847', '1555', 'q', 'f', 'X', '1567', '9091', '4491']

Answer:
28731