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: ['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']
Example Output: 31987

Example Input: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
Example Output: 12302

Example Input: ['1085', '1535', '6943', '531', 'z', 'w']
Example Output:
10094