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: ['t', '7469', 'Y', 'N', '8137']

Answer: 15606


Question: ['l', '2511', '2071', 'o', 'F', '7583', '1909', '1859', '3299', '3853', 'h', 'P', 'P', '9175', 'B', 'F']

Answer: 32260


Question: ['4125', 'P', '9423', '4289', '85']

Answer:
17922