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: ['8109', '5635', 'u', 'M', '1009']

Answer: 14753


Question: ['2625', '1611', 'E', '4507', '3013', '1569', 'M', '2607', '1111', 'W']

Answer: 17043


Question: ['4279', 'B', '3453', 'I', 'T', 'Q', '8603', '9395', '4083', '101', '2083', '6253', 'q', 'f', '2855', 's', '951', '665', 'O']

Answer:
42721