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: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']

Answer: 44216


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

Answer: 12538


Question: ['1825', 'X', '5567', 'y', '7251', '2125', 'H', '9193', 's', 'S', 'X', '1969', '711']

Answer:
28641