instruction:
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.
question:
['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']
answer:
20701


question:
['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']
answer:
28054


question:
['1595', '5861', 'g', 'H', 'h', '1449', '1993', '3569', 'M', 'o', '6587', 'w', 'y', '7063', '8723', '3729', 'Q']
answer:

40569