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: ['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']

Answer: 12879


Question: ['r', 'B', '8791', '3165', 'n', 'm']

Answer: 11956


Question: ['z', 'q', '401', 'Z', 'W', 'r', '7535', '9859', '3635', '1561', '6379']

Answer:
29370