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: ['X', 'f', 'p', 'R', 'N']

Answer: 0


Question: ['7361', '6913', '3605', '2081', '7619']

Answer: 27579


Question: ['c', '8583', '3563', '3325', '7821']

Answer:
23292