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: ['e', '6633', '131', '7459', '3733']

Answer: 17956


Question: ['x', 'V', 'g', '5469', 'c', '7873', 'T', 'p', '8109', '5395', 'h', 'z', 'T', '9373']

Answer: 36219


Question: ['5299', 'l', '6999']

Answer:
12298