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: ['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']

Answer: 33659


Question: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']

Answer: 30737


Question: ['J', 'v', 'P', 'k', 'y', 'k', '5337', '2783', 'I', 'V', '8873', 'G', 'C', 'I', '4785', '6783', 'P', '2683', 's']

Answer:
31244