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:
['4701', 'b', 'i', 'B', 'z', '7837', 'W']
answer:
12538


question:
['m', 'g', '7251', '5873', '59', '7345']
answer:
20528


question:
['3149', '4063', 'H', 'R', '5575', '7265', '1871', 'i', 'y', 'S', 'K', 'S', 'i', 'y', '811', 'P', 'Z', 'Q', 'M']
answer:

22734