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.

['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']
17914

['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']
21910

['4993', 'p', 'K', 'g', 'f', '8235', 'H', 'b', 'X', 'j', 'E', 'z', 'X', 'w', '5653']

18881