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: ['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']

A: 4975
****
Q: ['Q', '8841', 'H', 'v', '2435', '8221', '807', 'P', '2247', 'M', '4609', '5657', 'k', '2807', 'j', '8451']

A: 44075
****
Q: ['t', 'e', '2613', 'm', 'x', 'w', '5975', 'l', 'L', 'a', 'U', 'f', 'n', '5409']

A:
13997
****