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.

['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']
26596

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

['I', 'f', 'D', 'u', 'a', 'J', '833', 'v', 'F', '6687', '3175', 'f', 'q', '4299', 'u']

14994