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: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']

Answer: 14270


Question: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']

Answer: 24755


Question: ['B', 'K', 'V', '5211', '7227', '2767', '4445', 'Z']

Answer:
19650