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: ['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']

Answer: 30009


Question: ['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Answer: 5708


Question: ['7119', 'd', 'D', 'a', 'H', '8627', 'L', 'G', '3741', 'I', 'I', '4615', '6311']

Answer:
30413