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: ['x', 'd', '5121', 'I', '6737', '3789', '6167', 'C', '8947', 'k', '4715', '1885', 'H', 'B', '5685', 'S', '4615', 's', '7709']

Answer: 55370


Question: ['e', '6633', '131', '7459', '3733']

Answer: 17956


Question: ['3897', 'T', '9661', '5041', '4763', 'I', '3525', 'G']

Answer:
26887