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: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

Answer: 17925


Question: ['A', '9775', '5867', 'n', '1329', '5973']

Answer:
22944