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: ['5215', 'c', '839', 'V']

Answer: 6054


Question: ['q', 'I', 'E', 'M', 'T', 'i', '8719', 'r', 'V', '9759', 'I', '1793', 'Q', 'P', '5263', 'I', 'O', '8603', 'y']

Answer: 34137


Question: ['377', 'G', '2957', 'o', 'j']

Answer:
3334