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: ['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']

Answer: 31945


Question: ['Q', '2271', '1803', '2363']

Answer: 6437


Question: ['9251', 'f', 't', 'T', '1523', 'l', 'P', 'r', '969', '6737', '1109', '7283', '7045', 'R', '6043', '2607', 'D']

Answer:
42567