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.

[EX Q]: ['7959', '1345', '4605', '6453', 'Q']
[EX A]: 20362

[EX Q]: ['6577', 'Q', '6865', '7671', 'N']
[EX A]: 21113

[EX Q]: ['2933', 'T', 'p', 'Q', '827', '961', 'R', '4829', '5501', '8939', '41', '8661', '4099', 'Z', '8263', '59', 'C', '239']
[EX A]:
45352