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: ['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']

Answer: 31031


Question: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']

Answer: 12538


Question: ['T', '9921', 'O', '8675', '7339', 'V', '2727', 'D', '1329', '2877', '2923']

Answer:
35791