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:
['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']
answer:
33659


question:
['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']
answer:
35766


question:
['4685', '6517', '4419']
answer:

15621