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: ['z', 'j', 'M', 'E', '1689', '8413', '2603', 'b', '5101', 'w', 'r']

Answer: 17806


Question: ['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']

Answer: 28041


Question: ['6741', 'j', 'f', 'E', '5095', '6753', '4343', 't', 'm', '3461', 'p', '7873', '8581', 'l', '3083', 'y', '257']

Answer:
46187