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: ['r', 'B', '8791', '3165', 'n', 'm']

Answer: 11956


Question: ['1965', '8127', 'x', '4981', '8077', 'O', '467', '701', 'V', 'm', 'y', '5989', '123', 't', '4019', 'j', '1827', '8799']

Answer: 45075


Question: ['t', '3461']

Answer:
3461