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.

Q: ['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']

A: 21910
****
Q: ['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']

A: 19393
****
Q: ['u', '27', '2891', 'O', 'd', 'd', '6501', 'o', 'v', '7477']

A:
16896
****