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: ['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']

A: 56970
****
Q: ['z', 'U', '6817', 's', '3731', 'M', 'I', '1095', 'l', '5993', '5207', 'e', 'L', '5361', 'v', 'g', '1963', '4829', '9541', '8261']

A: 52798
****
Q: ['4427', '4579', '413', 'Y', '4567', '4421', '2959', '6953', 'C']

A:
28319
****