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.

Example Input: ['W', '8593', '9427', '9931', '8919', 'X', 'B', '8861', '1933', 'Z', 'V', '3427', 'S', '8717', 'd', '1593', '7659', 'Q', 'n']
Example Output: 69060

Example Input: ['S', 'W', '2171', '6405', 'h', 'C', '1597', '7109', 'Q', 'p', '2747', 't', 'J', 'q', '1883', 'v', 'O']
Example Output: 21912

Example Input: ['3751', 'X', '8719', '4679', '1909', '9267', '7189', '5035', '3247']
Example Output:
43796