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.

Example Input: ['6941', 'I', 'j', '6135', '6525', '7853', '5607']
Example Output: 33061

Example Input: ['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']
Example Output: 56970

Example Input: ['9731', 'd', 'F', 'C', 'Q', 'B', 'K', 'w', 'V', '93']
Example Output:
9824