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: ['g', 'h', '9141', '7825', 'a', 'u', '2389', 'r', '9739', '8337', 'Z', 'Z', '6717']

Answer: 44148


Question: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']

Answer: 14966


Question: ['I', '6787', 'F', 'x', '1749', '253', '5831', 'N', 'p', 'N', 'V']

Answer:
14620