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: ['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']

Answer: 36242


Question: ['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Answer: 5708


Question: ['S', 'R', 'j', '8701', '6953', 'Y', 'g', 'R', 'p', '163', '8541']

Answer:
24358