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: ['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']

Answer: 19001


Question: ['a', 'm', '3205', '1869', '1117', 'K', '5785']

Answer: 11976


Question: ['A', 'f', '6451', 'z', 'A', '1353', 'M', '469', '5605', 'U', 'j', 'g', 'J', '9671']

Answer:
23549