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: ['A', '9775', '5867', 'n', '1329', '5973']

Answer: 22944


Question: ['6577', 'Q', '6865', '7671', 'N']

Answer: 21113


Question: ['9025', 'u', 'Z', 'U', '2599', 'f', 'z', 'S', 'R']

Answer:
11624