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.

['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']
34764

['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']
25193

['3035', '6369', 'N', '5251', '3569', '3433', 'A', 'n', 'g', 'Y', '9077', '7581', 'w', 'E', 'S']

38315