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: ['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']

Answer: 55807


Question: ['A', '9979', '8723', '1131', 'i', 'p', 'M']

Answer: 19833


Question: ['F', 'g', '8791', 't', 'X', 'm']

Answer:
8791