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.

['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
33509

['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']
44566

['4937', 't', '2325', 'f', 't', '5281', '3081', 'N', 'o', 'm', '8625', '4923', '8211', 'F', 'x']

37383