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: ['l', 'B', 'Y', '7543', '5091', '1917']

Answer: 14551


Question: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

Answer: 26755


Question: ['X', 'j', 'O', 'I', 'Q', 'I', 'R', '1593', '8189', 'Q', 'e', '3331', 'e']

Answer:
13113