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:
['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
answer:
40372


question:
['6019', '1467', '3415', '7785']
answer:
18686


question:
['7997', '6973', '5735', '6487', 'Z', '9771', 'M', '1269', 'r', '6473', '7983', 'B', 'A', 'B', '3233', 'Q', 'Y', 'R', '6885']
answer:

62806