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.

['g', 'A', 'm', '4005', '8079', 'G']
12084

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

['633', '2599', 'L', '9527', 'M', '7885', 'y', '5241', '8941', 'a', 'l', '7087', '7047', 'U', '653', 'R', '7631', '1929', '7635']

66808