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: ['m', 'g', '7251', '5873', '59', '7345']

Answer: 20528


Question: ['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']

Answer: 31575


Question: ['5657', 'u', 'u', '8691', 'y', '8537', '9443']

Answer:
32328