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.

[Q]: ['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']
[A]: 61496


[Q]: ['r', '2251', 'X', 'H', 'a', '5463', 'g', 'M', '9797', '1581', 'o', 'm', 'v', 'E']
[A]: 19092


[Q]: ['1233', 'n', '7683', '9499', 'o', '7535', 'a', 'D', '1841', '2961', '4189', '431', '2413', 'k', 't', '9755', '3741', 'B', '7401', 'X']
[A]:
58682