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.
--------
Question: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']

Answer: 33509


Question: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']

Answer: 27419


Question: ['Q', 's', '6889', 'L', '8767', 'N', 'P', 'w', '5023', 'R', '8491', 's', 'Y', '5479', 'T', '3781', 'M', 'V']

Answer:
38430