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.
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Question: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

Answer: 17925


Question: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

Answer: 34764


Question: ['6705', 'J', '3015', '9361', '1609', 'W', '5061', '9973', 'v', 'f', 'o']

Answer:
35724