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: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']

Answer: 32209


Question: ['4685', 'q', 'O', 'o', '3453', 'o', 'Y', 'C', 'a', 'i', '7283', 'J', 'n', 'Q', 'i']

Answer: 15421


Question: ['s', '8873', '1099', 'q', 'o', '9873', '7003', '3739', '9543', 'K', 'W']

Answer:
40130