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: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

A: 34764
****
Q: ['291', 'R', 'N', '983', '2879', 'C', '3797', '4837', '793', '5489', 'k', '535', 'L', '3605', 's', '3701', 'U', '4399', '2489', '4739']

A: 38537
****
Q: ['G', '3129', 'b', 'u', '6425', 'g', 'L', 'N', '331', 'U', '5615', 'Q', 'j', '5521', '9367']

A:
30388
****