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: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

A: 26755
****
Q: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']

A: 24755
****
Q: ['f', 'j', 'u', 'X', '1769', '5041', 'V', '4891', 'B', '2851', '6317', '3533', 'S']

A:
24402
****