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: ['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']

Answer: 31575


Question: ['K', '479', 'u', '3489', 'o', '9589', '7153', '7649', '123', 'a', 'A', '3951', '847', 'N', 'R', '947', '9243', 'G', 'a']

Answer: 43470


Question: ['P', 'r', 'o', '1289', 'f', 'Z', '3091', '7553', '8487', '4497', '4085', 'c', '2011', '2105', '7069', '6869']

Answer:
47056