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.

Input: Consider Input: ['r', 'z', 'u', 'D', '3449', 'E', 'f', 'w', '1627', '4093', '955', 'i', 's', 'R', 'b', '9773', '2169', 'M', '9305', '4775']

Output: 36146

Input: Consider Input: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']

Output: 33794

Input: Consider Input: ['8559', '8137', '4927', 'W', 's', 'h', 't', '6219', '3427', 'Q', 'L', '5345', '4361', '1681', '6147', '63', '2039', '5949', '1539']
Output: 58393