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: ['2915', '4443', 'Z', '3409', '1417', 'H', 'T', 'u', '3373', 'U', '115', 'R']

Answer: 15672


Question: ['a', 'j', 'v', '619', 't', 'a', '5777', 'x', 'R', 'P', '8897', 'j']

Answer: 15293


Question: ['3085', 'p', 'T', '5241', 'a', '151', 'Q', '6287', '1229', 'Z', '9533', 'Y', '6487', '5343', '3407', '8527', 'o', '449', 'p']

Answer:
49739