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: ['r', '6537', '3001', '7879']

A: 17417
****
Q: ['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']

A: 61496
****
Q: ['E', 'I', '3371', '4165', 'N', 'R', '5455', '7379', '7221', '5779', 'w', 'z', '2967', '1175', 'j', '3909', 'M', '9231', 'a', '629']

A:
51281
****