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: ['6957', '4603', '5299', '8451', '9803', 'b']

Output: 35113

Input: Consider Input: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']

Output: 14270

Input: Consider Input: ['D', '8311', '1435', '8709', '2853', '153', '2621', 'l', 'h', '5871', '5797', 'x', '9391', '3239', 'x', '1973', 'K']
Output: 50353