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

['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']
41902

['I', '2857']

2857