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', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Answer: 32421


Question: ['A', '9775', '5867', 'n', '1329', '5973']

Answer: 22944


Question: ['9659', '5479', 'h', '4201', 'E', 'F', '4889', 'I', 'f', 'A', '9407', '3599', '5851', '2731', 'n', '9933']

Answer:
55749