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: ['6019', '1467', '3415', '7785']

A: 18686
****
Q: ['9403', 'u', '4159', 'w', '3467']

A: 17029
****
Q: ['U', '6471', 'j', 'C', 'Z', '873', 'p', 'I', 'D', 'o', '867', '3941', '3137', '1301']

A:
16590
****