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: ['9211', '1889', '7371', '9649', 'b', 'y', 'q', 'a', 'i', '1137', '3291', '8625']

Answer: 41173


Question: ['x', '1887', 'E', '3995', '5677', '2749', '9951']

Answer: 24259


Question: ['N', '3555', 'A', 'S', 'E', 'k', 'Z', '4339', 'j', 'o', 'm']

Answer:
7894