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: ['507', 'P', '9697', 'u', '5057']

Answer: 15261


Question: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']

Answer: 39921


Question: ['9571', '4383', 'b', 'V', 'p', '379', '7915', '9337', 'o', '8401', 'j', '7837', '5153']

Answer:
52976